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I do not have guppies or mollies. I have Swordtails and Platies and they have interbred.
Anders247 says that a Guppy/Molly mix would be sterile...I would take him at his word. He has just started on this forum, but is a heavy hitter on other forums.
That's what I do also I read egg yolk mixed with a little water? I tried it and they ate it all up I shut my filter off while they eat but I think they liked the egg better lol!
Egg yolk has a lot of protein for the guppy fry to develop healthy. I would do it for the first 1-2 weeks until they are bigger and can feed better on flakes.