He's just turned 6 and is 110cm.
DH is 5ft 8 and I'm 5ft 2. DH was tiny until he was about 13 and then shot up to his princely height. He said he didn't care as - I quote - he ran with the cool crowd and could make everyone laugh - but DS is getting comments. I feel protective.
Oh, and he hardly ever goes up in shoe size. He's got teeny feet