Yes for mollies they come out big enough to feed finely crushed flake food. I would suggest taking some flakes, rolling it up like you would a cigarette between your fingers and crush it that way. It needs to be small. Feed them often, but make sure the water quality doesn't suffer.
If you feel really adventureous you could hatch some Baby Brine Shrimp and feed them those. Fry usually grow about twice as fast on BBS. Just make sure you feed the BBS soon after they hatch (within 24 hrs) because they start to lose their nutritional value after that.