I'm wanting to increase my stash and have both bubs in full time MCN's. DS is part time atm (sposies for sleeping and going out) and we have about 10 one size which does us 1.5-2 days. For the new bub, I already have about 5 newborn/small sized nappies for her.

I am guessing DS will still be in nappies for a little while longer. He will be 20 months when this baby is born and I'm not ready to TT him with a newborn on the scene

How many nappies will I need for both of them full time? Is it better to go sized for the new baby or just go all one size?

And also what is the difference between a booster and an insert?

Are the different types of material (bamboo, microfibre, fleece?) more suitable for girls or boys?

Thanks ladies