Not remotely.

But it depends on your definition of 'celebrating'. At 1 and 2, they're really not old enough to appreciate what a birthday is.

Of course not, humans lived and evolved for a million years without celebrating birthdays, so the only reason not celebrating them now might be harmful is that the child knows that it's a normal thing in society and since he doesn't get it thinks his parents must not love him.. but at those ages the child knows fuckall about birthdays, so it doesn't matter.

might not remember the birthday itself, but I wouldn't discount the impact on development just because of that. not an expert in developmental psychology so I can't pass judgement on how harmful or harmless this is, I tend to guess it's not.

I dont think they even know what a birthday means at that age tbh

Is their ppl that do that? I had friends that were poor and still had some kind if birthday party. It's supposed to be the celebration of the best moment of the parent's life. The birth of your kid:)

...theres a reason some people call them 'momaversiaries' (no idea how its spelt) They are cute things for the family tbh

When they see that their friends' birthdays are celebrated they might feel a bit weird and unloved. Anyway, I wouldn't miss the opportunity to make my kid happy.

No, it would simply make them not get used to a cultural tradition early on