I was born a month early on my Dad's birthday which is the 21st and only immediate family bother celebrating the two different days which really bothers me.
The only thing I like about the day is that it is also my Dad's birthday but I definitely don't resent my mum for it, why would you?
I also have a step cousin born on Christmas whose birthday pretty much gets forgotten.
I don't like cheapskates who say the whole one present thing. Fine, I'll do the same thing. Even if your birthday is in July.