I got Riley his first buddy belt when he was 1-year/5-months old....
just bought him 2 more last month in the same size.
I thought the same thing about him at that age. I didn't think he would grow anymore.....
His height and length stopped at around 1-year old but he continued "filling out" until he was
about 1-year/4-months old..... He is the same weight now at 2-years old then he was then.