Sorry but I just think you're either inclined to be a precious type or you're not, regardless of how many children you have.
I know a woman who has 3 kids and she's still sooooo bloody precious about all 3 of them - and the youngest one is now 12!!
Then there's me - only one child and I'm very laid back and always have been. I come from a very long line of laid back people so it's in the genes. My DS is also incredibly laid back.
So in short, I think it's either in you to be a "precious" fuss pot or it's not.