Justice Rehnquist
delivered the opinion of the Court.
This Court has held that once a State posits a judicially enforceable right of children to support from their natural fathers, the Equal Protection Clause of the Fourteenth Amendment prohibits the State from denying that same right to illegitimate children. Gomez v. Perez, 409 U. S. 535 (1973). In this case we are required to determine the extent to which the right of illegitimate children recognized in Gomez may be circumscribed by a State’s interest in avoiding the prosecution of stale or fraudulent claims. The Texas Court of Civil Appeals, Thirteenth Supreme Judicial District, upheld against federal constitutional challenges the State’s one-year statute of limitation for suits to identify the natural fathers of illegitimate children. We noted probable jurisdiction. 451 U. S. 936. We begin by reviewing the history of the statute challenged by appellant.
I
Like all States, Texas imposes upon parents the primary responsibility for support of their legitimate children. See Tex. Fam. Code Ann. (Code) §§4.02, 12.04(3) (1975 and Supp. 1982). That duty extends beyond the dissolution of marriage, Code § 14.05, regardless of whether the parent has custody of the child, Hooten v. Hooten, 15 S. W. 2d 141 (Tex. Civ. App. 1929), and may be enforced on the child’s behalf in civil proceedings. Code § 14.05(a). Prior to our decision in Gomez, Texas recognized no enforceable duty on the part of a natural father to support his illegitimate children. See Home of the Holy Infancy v. Kaska, 397 S. W. 2d 208 (Tex. 1965); Lane v. Phillips, 69 Tex. 240, 6 S. W. 610 (1887); Bjorgo v. Bjorgo, 391 S. W. 2d 528 (Tex. Civ. App. 1965). A natural father could even assert illegitimacy as a defense to [93]*93prosecution for criminal nonsupport. See Curtin v. State, 155 Tex. Crim. 625, 238 S. W. 2d 187 (1950).
Reviewing the Texas law in Gomez, we held that “a State may not invidiously discriminate against illegitimate children by denying them substantial benefits accorded children generally.” 409 U. S., at 538. “[O]nce a State posits a judicially enforceable right on behalf of children to needed support from their natural fathers,” we stated, “there is no constitutionally sufficient justification for denying such an essential right to a child simply because its natural father has not married its mother.” Ibid. Although we recognized that “the lurking problems with respect to proof of paternity . . . are not to be lightly brushed aside,” we concluded that they did not justify “an impenetrable barrier that works to shield otherwise invidious discrimination.” Ibid. Accordingly, we held Texas’ denial of support rights to illegitimate children to be a denial of equal protection of law.
In response to our decision in Gomez, the Texas Legislature considered legislation that would have provided illegitimate children with a cause of action to establish the paternity of their natural fathers and would have imposed upon those fathers the same duty of support owed to legitimate children. The legislature did not enact that legislation, however, choosing instead to establish a procedure by which natural fathers voluntarily could legitimate their illegitimate children and thereby take upon themselves the obligation of supporting those children. Texas Dept. of Human Resources v. Hernandez, 595 S. W. 2d 189, 191 (Tex. Civ. App. 1980). No provision was made for illegitimate children to seek support from fathers who fail to support them.
Not suprisingly, this legislation was found by Texas courts to be an inadequate response to Gomez. A panel of the Texas Court of Civil Appeals held that, because of Gomez, “[w]hen the Legislature later provided judicial relief against the father on behalf of a legitimate child for support, it neces[94]*94sarily provided the same relief on behalf of an illegitimate child.” In re R - V - M -, 530 S. W. 2d 921, 922-923 (1975). Only after this judicial recognition of a right to support did the Texas Legislature establish procedures for a paternity and support action on behalf of illegitimate children. Texas Dept. of Human Resources v. Hernandez, supra, at 191.
The rights of illegitimate children to obtain support from their biological fathers are now governed by Chapter 13 of Title 2 of the Code § 13.01 et seq. The Code recognizes that establishment of paternity is the necessary first step in all suits by illegitimate children for support from their natural fathers. See In re Miller, 605 S. W. 2d 332, 334 (Tex. Civ. App. 1980); Texas Dept. of Human Resources v. Delley, 581 S. W. 2d 519, 522 (Tex. Civ. App. 1979). Accordingly, Chapter 13 establishes procedures to be followed in judicial determinations of paternity and works in conjunction with other provisions of the Code to establish the duty of fathers to support their illegitimate children. See Code §§ 12.04, 14.05. Once paternity has been determined, Chapter 13 authorizes the court to order the defendant father “to make periodic payments or a lump-sum payment, or both, for the support of the child until he is 18 years of age,” Code § 14.05(a). See Code § 13.42(b).
Although it granted illegitimate children the opportunity to obtain support by establishing paternity, Texas was less than generous. It significantly truncated that opportunity by the statutory provision at issue in this case, § 13.01:
“A suit to establish the parent-child relationship between a child who is not the legitimate child of a man and the child’s natural father by proof of paternity must be brought before the child is one year old, or the suit is barred.”
Texas views this provision as part of the substantive right accorded illegitimate children, not simply as a procedural limi[95]*95tation on that right. Texas Dept. of Human Resources v. Hernandez, supra, at 192-193. Moreover, Texas courts have applied § 13.01 literally to mean that failure to bring suit on behalf of illegitimate children within the first year of their life “results in [their] being forever barred from the right to sue their natural father for child support, a limitation their legitimate counterparts do not share.” In re Miller, supra, at 334. Thus, in response to the constitutional requirements of Gomez, Texas has created a one-year window in its previously “impenetrable barrier,” through which an illegitimate child may establish paternity and obtain paternal support.1
h — t HH
Appellant in this case is the mother of a child born out of wedlock in early 1977. In October 1978, she and the Texas Department of Human Resources, to which appellant had as[96]*96signed the child’s support rights,2 brought suit on behalf of the child to establish that appellee was his natural father. Appellee answered by asserting that the action was barred by § 13.01 because the child was one year and seven months old when the suit was filed. The trial court agreed with ap-pellee and dismissed the suit.
The dismissal was affirmed on appeal by the Texas Court of Civil Appeals, and discretionary review was denied by the Texas Supreme Court upon a finding of no reversible error.
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Justice Rehnquist
delivered the opinion of the Court.
This Court has held that once a State posits a judicially enforceable right of children to support from their natural fathers, the Equal Protection Clause of the Fourteenth Amendment prohibits the State from denying that same right to illegitimate children. Gomez v. Perez, 409 U. S. 535 (1973). In this case we are required to determine the extent to which the right of illegitimate children recognized in Gomez may be circumscribed by a State’s interest in avoiding the prosecution of stale or fraudulent claims. The Texas Court of Civil Appeals, Thirteenth Supreme Judicial District, upheld against federal constitutional challenges the State’s one-year statute of limitation for suits to identify the natural fathers of illegitimate children. We noted probable jurisdiction. 451 U. S. 936. We begin by reviewing the history of the statute challenged by appellant.
I
Like all States, Texas imposes upon parents the primary responsibility for support of their legitimate children. See Tex. Fam. Code Ann. (Code) §§4.02, 12.04(3) (1975 and Supp. 1982). That duty extends beyond the dissolution of marriage, Code § 14.05, regardless of whether the parent has custody of the child, Hooten v. Hooten, 15 S. W. 2d 141 (Tex. Civ. App. 1929), and may be enforced on the child’s behalf in civil proceedings. Code § 14.05(a). Prior to our decision in Gomez, Texas recognized no enforceable duty on the part of a natural father to support his illegitimate children. See Home of the Holy Infancy v. Kaska, 397 S. W. 2d 208 (Tex. 1965); Lane v. Phillips, 69 Tex. 240, 6 S. W. 610 (1887); Bjorgo v. Bjorgo, 391 S. W. 2d 528 (Tex. Civ. App. 1965). A natural father could even assert illegitimacy as a defense to [93]*93prosecution for criminal nonsupport. See Curtin v. State, 155 Tex. Crim. 625, 238 S. W. 2d 187 (1950).
Reviewing the Texas law in Gomez, we held that “a State may not invidiously discriminate against illegitimate children by denying them substantial benefits accorded children generally.” 409 U. S., at 538. “[O]nce a State posits a judicially enforceable right on behalf of children to needed support from their natural fathers,” we stated, “there is no constitutionally sufficient justification for denying such an essential right to a child simply because its natural father has not married its mother.” Ibid. Although we recognized that “the lurking problems with respect to proof of paternity . . . are not to be lightly brushed aside,” we concluded that they did not justify “an impenetrable barrier that works to shield otherwise invidious discrimination.” Ibid. Accordingly, we held Texas’ denial of support rights to illegitimate children to be a denial of equal protection of law.
In response to our decision in Gomez, the Texas Legislature considered legislation that would have provided illegitimate children with a cause of action to establish the paternity of their natural fathers and would have imposed upon those fathers the same duty of support owed to legitimate children. The legislature did not enact that legislation, however, choosing instead to establish a procedure by which natural fathers voluntarily could legitimate their illegitimate children and thereby take upon themselves the obligation of supporting those children. Texas Dept. of Human Resources v. Hernandez, 595 S. W. 2d 189, 191 (Tex. Civ. App. 1980). No provision was made for illegitimate children to seek support from fathers who fail to support them.
Not suprisingly, this legislation was found by Texas courts to be an inadequate response to Gomez. A panel of the Texas Court of Civil Appeals held that, because of Gomez, “[w]hen the Legislature later provided judicial relief against the father on behalf of a legitimate child for support, it neces[94]*94sarily provided the same relief on behalf of an illegitimate child.” In re R - V - M -, 530 S. W. 2d 921, 922-923 (1975). Only after this judicial recognition of a right to support did the Texas Legislature establish procedures for a paternity and support action on behalf of illegitimate children. Texas Dept. of Human Resources v. Hernandez, supra, at 191.
The rights of illegitimate children to obtain support from their biological fathers are now governed by Chapter 13 of Title 2 of the Code § 13.01 et seq. The Code recognizes that establishment of paternity is the necessary first step in all suits by illegitimate children for support from their natural fathers. See In re Miller, 605 S. W. 2d 332, 334 (Tex. Civ. App. 1980); Texas Dept. of Human Resources v. Delley, 581 S. W. 2d 519, 522 (Tex. Civ. App. 1979). Accordingly, Chapter 13 establishes procedures to be followed in judicial determinations of paternity and works in conjunction with other provisions of the Code to establish the duty of fathers to support their illegitimate children. See Code §§ 12.04, 14.05. Once paternity has been determined, Chapter 13 authorizes the court to order the defendant father “to make periodic payments or a lump-sum payment, or both, for the support of the child until he is 18 years of age,” Code § 14.05(a). See Code § 13.42(b).
Although it granted illegitimate children the opportunity to obtain support by establishing paternity, Texas was less than generous. It significantly truncated that opportunity by the statutory provision at issue in this case, § 13.01:
“A suit to establish the parent-child relationship between a child who is not the legitimate child of a man and the child’s natural father by proof of paternity must be brought before the child is one year old, or the suit is barred.”
Texas views this provision as part of the substantive right accorded illegitimate children, not simply as a procedural limi[95]*95tation on that right. Texas Dept. of Human Resources v. Hernandez, supra, at 192-193. Moreover, Texas courts have applied § 13.01 literally to mean that failure to bring suit on behalf of illegitimate children within the first year of their life “results in [their] being forever barred from the right to sue their natural father for child support, a limitation their legitimate counterparts do not share.” In re Miller, supra, at 334. Thus, in response to the constitutional requirements of Gomez, Texas has created a one-year window in its previously “impenetrable barrier,” through which an illegitimate child may establish paternity and obtain paternal support.1
h — t HH
Appellant in this case is the mother of a child born out of wedlock in early 1977. In October 1978, she and the Texas Department of Human Resources, to which appellant had as[96]*96signed the child’s support rights,2 brought suit on behalf of the child to establish that appellee was his natural father. Appellee answered by asserting that the action was barred by § 13.01 because the child was one year and seven months old when the suit was filed. The trial court agreed with ap-pellee and dismissed the suit.
The dismissal was affirmed on appeal by the Texas Court of Civil Appeals, and discretionary review was denied by the Texas Supreme Court upon a finding of no reversible error.3 The Court of Civil Appeals, relying upon its decision in Texas Dept, of Human Resources v. Hernandez, 595 S. W. 2d 189 (1980), held that the one-year limitation was not tolled during minority and did not violate the Equal Protection Clause of the Fourteenth Amendment. The Hernandez decision in turn relied upon the constitutional analysis in Texas Dept, of Human Resources v. Chapman, 570 S. W. 2d 46 (Tex. Civ. App. 1978), where another division of the Court of Civil Appeals had found that “the legitimate state interest in precluding the litigation of stale or fraudulent claims” was rationally related to the one-year bar and therefore did not deny illegitimate children equal protection of the law. Id., at 49.
Appellant argues that the § 13.01 bar imposes a burden on illegitimate children that is not shared by legitimate children, and that the burden is not justified by the State’s interest in avoiding the prosecution of stale or fraudulent claims. In [97]*97addition, appellant argues that §13.01 deprives illegitimate children of their right to support without due process of law. Because we agree with appellant’s first argument, we need not consider her second.
III
Our decision in Gomez held that “a State may not invidiously discriminate against illegitimate children by denying them substantial benefits accorded children generally.” 409 U. S., at 538. Specifically, we held that a State which grants an opportunity for legitimate children to obtain paternal support must also grant that opportunity to illegitimate children. If Gomez and the equal protection principles which underlie it are to have any meaning, it is clear that the support opportunity provided by the State to illegitimate children must be more than illusory. The period for asserting the right to support must be sufficiently long to permit those who normally have an interest in such children to bring an action on their behalf despite the difficult personal, family, and financial circumstances that often surround the birth of a child outside of wedlock. It would hardly satisfy the demands of equal protection and the holding of Gomez to remove an “impenetrable barrier” to support, only to replace it with an opportunity so truncated that few could utilize it effectively.
The fact that Texas must provide illegitimate children with a bona fide opportunity to obtain paternal support does not mean, however, that it must adopt procedures for illegitimate children that are coterminous with those accorded legitimate children. Paternal support suits on behalf of illegitimate children contain an element that such suits for legitimate children do not contain: proof of paternity. Such proof is often sketchy and strongly contested, frequently turning upon conflicting testimony from only two witnesses. Indeed, the problems of proving paternity have been recognized repeatedly by this Court. Parham v. Hughes, 441 [98]*98U. S. 347, 357, 361 (1979); Lalli v. Lalli, 439 U. S. 259, 269 (1978); Trimble v. Gordon, 430 U. S. 762, 772 (1977); Gomez v. Perez, 409 U. S., at 538.4
Therefore, in support suits by illegitimate children more than in support suits by legitimate children, the State has an interest in preventing the prosecution of stale or fraudulent [99]*99claims, and may impose greater restrictions on the former than it imposes on the latter. Such restrictions will survive equal protection scrutiny to the extent they are substantially related to a legitimate state interest. See Lalli v. Lalli, supra, at 265; Trimble v. Gordon, supra, at 767; Mathews v. Lucas, 427 U. S. 495, 510 (1976).5 The State’s interest in avoiding the litigation of stale or fraudulent claims will justify those periods of limitation that are sufficiently long to present a real threat of loss or diminution of evidence, or an increased vulnerability to fraudulent claims.
The equal protection analysis in this case, therefore, focuses on two related requirements. First, the period for obtaining support granted by Texas to illegitimate children must be sufficiently long in duration to present a reasonable opportunity for those with an interest in such children to assert claims on their behalf. Second, any time limitation placed on that opportunity must be substantially related to [100]*100the State’s interest in avoiding the litigation of stale or fraudulent claims. Applying these two requirements to the one-year right granted by Texas, we find a denial of equal protection.
By granting illegitimate children only one year in which to establish paternity, Texas has failed to provide them with an adequate opportunity to obtain support. Paternity suits in Texas “may be brought by any person with an interest in the child,” Code § 11.03, but during the child’s early years will often be brought by the mother. It requires little experience to appreciate the obstacles to such suits that confront unwed mothers during the child’s first year. Financial difficulties caused by childbirth expenses or a birth-related loss of income, continuing affection for the child’s father, a desire to avoid disapproval of family and community, or the emotional strain and confusion that often attend the birth of an illegitimate child all encumber a mother’s filing of a paternity suit within 12 months of birth. Even if the mother seeks public financial assistance and assigns the child’s support claim to the State, it is not improbable that 12 months would elapse without the filing of a claim. Several months could pass before a mother finds the need to seek such assistance, takes steps to obtain it, and is willing to join the State in litigation against the natural father.6 A sense of the inadequacy of this one-year period is accentuated by a realization that failure to file within 12 months “results in illegitimates being forever barred from the right to sue their natural father for child support,” In re Miller, 605 S. W. 2d, at 334, while legitimate children may seek such support at any time until the age of 18.7
[101]*101Moreover, this unrealistically short time limitation is not substantially related to the State’s interest in avoiding the prosecution of stale or fraudulent claims. In Gomez we recognized that the problems of proof in paternity suits “are not to be lightly brushed aside,” but held that such problems do not justify a complete denial of support rights to illegitimate children. 409 U. S., at 538. Neither do they justify a period of limitation which so restricts those rights as effectively to extinguish them. We can conceive of no evidence essential to paternity suits that invariably will be lost in only one year, nor is it evident that the passage of 12 months will appreciably increase the likelihood of fraudulent claims.8
Accordingly, we conclude that the one-year period for establishing paternity denies illegitimate children in Texas the equal protection of law.9 The judgment of the Texas [102]*102Court of Civil Appeals is reversed, and the case is remanded for further proceedings not inconsistent with this opinion.
Reversed.