I think she’ll give it a shot, or invent a fake one and run with that online.The thing with hiding or lying about the birth date she needs to keep up the lie. Just think of his birthdays. She’d slip up somehow. I think she will announce when he’s born. There’s no point keeping it. She’d never be able to just disappear offline for a few weeks to hide it. It would be blaringly obvious.
a lady I know who’s in her 80s had a fake birthday for most of her life because she was conceived out of wedlock and her parents hid it by inventing a fake birthday, four months later than we real one. They didn’t introduce her to people until she was older. She didn’t know until her mother died and they were going through her house and found her birth certificate.
People do extreme things to keep up societal appearances