Lincoln's birthday

[Steve]

I read it as Dr. Temple implying that Robert's birthday was faked to make it look like there was no problem with the dates. The Lincolns were married in Springfield and Robert was born there. Temple's theory is absurd. Mary wouldn't be able to know if she was pregnant when they married if Robert's birth date is correct. Chronologically, the theory is only possible if they fudged Robert's birth date and possibly hid him in their house for a month or so to alleviate suspicion. How would that escape notice, especially with Lincoln's congressional campaign a few years later?