Susan, it's worth a try to see if a birth certificate is recorded in Dallas Co.See below for instructions:
Dallas County, TX Birth, Death, Marriage, Divorce Records Dallas County vital records are maintained by the county clerk in Dallas, who can be contacted by mail, email, phone, fax, or in person. Duplicate copies have been filed with the state since 1903 and can also be obtained online through TexasOnline, the official eGovernment site for Texas. Informational copies are readily available, but certified copies are restricted for 25 years for death certificates and 75 years for birth certificates. This large county of over 2,000,000 was formed in 1846 from Nacogdoches and Robertson Counties; formerly populated by the Caddoan Native Americans, Anglo-Americans started settling here in 1840.
Dallas County Recorder Office - Birth, Death, Marriage & Divorce Records
Dallas County 509 Main St Records Bldg, 2nd Fl Dallas, TX 75202-3502 Hours of Operation: 8AM-4:30PM CST Website Phone: 214-653-7099 Fax: 214-653-7176