No i don't think you are odd.

I have trouble remembering anything from DD1's first 12months (she's 7). My PND was horrendous. I wrote a few things down, but if I really wanted to remember I'd have to go back through photos for dates. I remember she got 11 teeth in a fortnight at 11 months old. I remember the hard stuff more than the good though, which is sad, because that's where my head was.
DS is 4.5 I remember he walked because it was the day before his first birthday. I remember his teeth because he got 16 in a month.
Poor DD2, I hope she never asks me for dates lol.