Awww. They are wittle.Sorry, babies are my favorite.
They will do fine on 20-30 grams of food. So, they need about 4 a week. You can try all at once, or 2 twice a week. It seems like a lot of work, but your guys are pretty small so it probably won't stress them out too much. At this point they will take what they can get. The great thing about young ones.