Not having done babies myself, here is what I'm planning for tubs:
- Vision V-18 (up to 400 grams - can go twice that if needed)
- Vision V-28 (up to 1500 grams - adult males)
- Vision V-70 (over 1500 grams - adult females)

I do know that some skip the middle size and go straight from hatchling tubs to adult tubs.