@HerraBRE Except if mom is a narcissist, in which case she'll do all the prep work by declaring your birthday as actually being *her* birthday for the above stated reasons.
(I'm honestly not trying to be needlessly contrary here, but the "it's actually *my* birthday since I gave birth to you" is depressingly common among narcissistic mothers, so it may be good to be aware of this and the resulting emotional context when bringing the subject up.)