Things seem to be quite different these days or at least for some families as far as their kids birthdays go. When my kids were young we mostly did home based birthday parties. We invited kids they knew or neighbors kids, maybe 5 to 10 or so. My wife baked and decorated a cake, the kids played Pin the Tail on the Donkey, sometimes we had a blow up kiddie pool or a slip and slide.
Times change...
I have a niece who lives in southern California who had a baby boy later in life and she and her husband live a pretty good life. Their son just celebrated his 1st birthday and they through him a big party. They invited 50 of is closest friends and their families and had a huge catered meal served. They had a moon walk bouncy thing even though he is too young to really get up in it. They had face painting and a pinata. They hired a Mickey Mouse impersonator, like the folks at Disneyland dressed up who came for a few hours. He got a ton of presents including a big battery powered Mercedes Benz he can drive in once he is old enough to do it (the box said for children 7 and older!).