For me it think its way overkill one birthday is enough and it doesn't need to be extravagant ill be doing for my kids what was done for me a small family gathering or some friends and a larger party on significant years ie 1,5,10,13,16,18,21
I'm a big believer in making a themed cake myself of whatever there interest is at the time for me I really enjoy that and it brings back happy memories of my mum doing the same
I just don't want my children to be over spoilt and I don't want to have a nervous breakdown having to plan and find money for massive parties at least twice a year