My son will be 6 months on the 18th and is still in 0-3 month clothes

My son is in 12-18 and hes 9m 😂

Some clothes I think run small, or that I either have a tall boy lol, I could never figure that one out haha. My son was was 22in at birth and just grew way too fast from there. Now he's 2 and like 39inches 😭 he went through sizes so fast