My grandfather Udell Cunningham is fond of telling the story about how his birth was erroneously recorded, causing a great deal of trouble for him later on.
My grandfather was born 3 May 1925 in Tulia, Swisher County, Texas. The Texas Birth Index, 1903-1997 (available on Ancestry.com) lists his birthday as 3 March 1925. The way my grandfather tells the story, the clerk in charge of recording births on the ledger was “too lazy” to turn the page to May. His memory is that he was recorded with an April birthdate; however, the record says March.
At some point, it became necessary for him to have the error corrected, but making the change proved to be difficult, as vital records employees refused to make the change without evidence. Ultimately, my grandfather had to bring his parents to the record office to swear as to the date of his birth before he was able to get a corrected birth certificate. The date in the Texas Birth Index is still incorrect.
While vital records are excellent proof, and genealogists should always cite sources, we should always remember that even vital records can be incorrect. It’s better, if you can, to check information against several sources. Worse errors than birthdate mistranscription have occurred, and we can save ourselves a lot of time in correcting erroneous files if we use multiple sources.