Some of the above posts are terribly sad.
My early experiences of birthdays before my parents divorced and my mother had to keep my sister and myself on her own were good.
Though we did not have too much spare cash I had a card every year and a present. I had a party and an ice cream cake on my fifth birthday and another party in the garden after school when I was nine. I had, over the years, two second hand bikes, a doll's house dad made, clothes I needed and so on.
For Christmas I had one proper present and a few little somethings like sweets in a pillowcase, about which I was wildly excited. I had, variously, a Spirograph, a post office set, a giant doll and, again, clothes I needed.
When you were poor in the old days, birthdays and Christmases were when you got things your parents had to buy you like coats.
I don't remember feeling left out or that I got significantly less than everyone else as no one had the sort of cash or credit which is common today. Only rich children got as much as poor children do now.
With my own children I have been very generous with their presents though not as extravagent as some of their richer friends' parents. Neither of them got an iPhone!
We also adopted a birthday habit from my OH's family which was to buy the non-birthday child a 'little something' as well to sweeten the pill of being left out. My own kids always had a present, a card and a party or treat and we all look forward to each other's birthdays.
Thinking about today, I have, this weekend, along with my OH and DS, done a 200 mile round trip to my mother's residential home for her birthday laden with presents, cards, a cake and I took her out to lunch with my sister.
In a couple of weeks I have my own birthday and my lovely family have 'crowd funded' a fantastic present and my DD and her BF are joining us for the weekend. I really appreciate the time they are giving up as they are both busy young people.
In our family we are very big on birthdays and Christmas. My DD is spending her first Christmas away from home with her fiance's family and I am dreading it.