Hate to break it to you, OP, but if you have zero interest in children it doesn't matter whose they are. My best friend from school, who I also knew from about that age, had one child, and while I visited her in hospital to congratulate her afterward, it was about her, not the baby, and I certainly never remembered when the child's birthday was. I have absolutely no interest in anybody's children and the one friend I have at present who has a toddler (all my other friends are much older) has the sense not to expect people to feign interest in him when he has nothing to do with them.
@lovelyxbones - read this from @Catsmere .
You are making a juvenille error of assuming that everyone thinks like you. Plenty of people have no interest in other peoples children and are only interested in there own. Plenty of people who don't have children aren't interested in any children full stop.
Not only did she not wish her a happy birthday, she has not once asked how she is doing or how I am doing.
you are moving the goal posts here but as I've said wanting someone who is your friend to care about wishing a one year old (who repeating has no idea what a birthday is at all) happy birthday is a both madness and a route to unhappiness.
asking "how she is doing" is in the same class. how exactly can a one year old be doing really? she's either healthy or not. if there is a problem, she'd expect you to tell her.
as for asking how you are doing - no one does that with good friends do they? because your good friends tell you without an enquiry as part of the normal flow of conversation.
you are moving the goals posts here because I was just specifically talking about the birthday of a one year old. If for you this is a hill to die on, you potentially will lose (and miss out on making new ) friends because NO ONE CARES ABOUT YOUR CHILDREN. ANYONE ASKING IS JUST BEING POLITE UNLESS THEY ARE DIRECTLY RELATED - and sometimes not even then - lots of posts on here whinging about disinterested grandparents, in-laws, aunts, uncles and so on.
If you persist in believing otherwise, carry on but you are seriously mistaken as not just me but others on this thread have also said.
again repeating, I'm just taking about this issue not other problems you may have with the friendship.