It does probably depend on the cat. It's so hard to tell because you see them every day. Looking back at pictures, I don't think Hank and Cooter have grown much in the past 5 months (after turning 1), but Turk has definitely gotten bigger since his first birthday. He was always sort of a runt and is now smaller than our youngest who turned 9-months old yesterday. Lynkin is still growing like mad. He's a regular cat now.