My son is 18 months and weighs 28lbs. He is very long. Lots of his nappies are getting too small now including some meant to be birth to potty. His others are a size 2 and they are getting small too. Even though he knows what the potty is for and knows when he wants his nappy changed, he is know where near training. Need 3-4 more nappies but no idea where to start. Last time I bought his nappies I chose most of them because they were blue or had cars on!! Also his xl minki huggles are getting tight. Does anyone know if they shrink in which case I will buy 2 more for night, or is there a bigger size/better night nappy?