Re: weight question
I think you can relax. Your baby is still so young! He's not likely to stay in the 100th %ile much longer- once he gets just a little older he's going to start putting his calories into things like reaching, rolling, squirming, crawling, etc., and he's going to drop down the charts a bit. That's what tends to happen with breastfed babies- they zoom up to the top of the charts, then level off.
Is your baby being measured on the new WHO charts for breastfed babies, or the old CDC charts developed using data from primarily formula-fed babies? That can make a big difference in where your child appears to be on the charts. Breastfed babies tend to gain weigh fastest in early infancy and slow down as they get into the middle of their first year. Formula-fed babies gain relatively slowly at first, and then speed up as they get older. Measure a breastfed baby on a formula chart, and the breastfed baby will appear to be gaining weight "too fast" at first and "too slow" later on.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"