We are going on holiday on the 13th June, my son is 4 months old and is in 3-6 month clothing at the moment but it won’t be long until he moves on to 6-9 as he is a big baby. He was 9lb1oz at birth. I’m wondering how long he will stay in 6-9 month clothing for? I need to start holiday shopping for clothes but I am struggling on what size to get. I would say in May he will be going in to 6-9 months.