That's so cute. No you are not a nerd for that, I have all of Hot Rod's baby teeth when he had them taken out and I did save some of his hair when he got his first cut but I don't know what happened to it.
I also celebrated when he gained some weight, it took forever to hit that 3 lb mark. It was 2.4, 2.6, 2.8, 2.9 then finally 3.1. lol.