I'm normally a 16D and ended up in a 20D by 9 months. I lost so much weight though that I am now finding my old 16D is right for band size but I need more like a DD cup.

I wouldn't recommend the hot milk brand either. I am finding that they just can't support the weight of my boobs now that I've got heaps of milk.

So my recommendation would be to buy the minimum you need as you go along and then once your milk supply settles go bra shopping again. I've wasted so much money