Around 6 months.

@babynessa, when do you think your little one started wearing size 2?

I have 33 pairs of shoes sitting in a box and most of them have never been worn because she out grew them. She has one pair of boots (size 3) that fit and that's all right now. Not buying her anymore shoes until she outgrows her boots which shouldn't take long.

My son grew out of his size 5 that he had been wearing for about a month overnight. Every child is different but they do outgrown them kinda fast.