They are simply adorable! What wonderful additions to your finny family. I haven't had any of my platys pop yet.
I feed my fry some fry milk twice a day and some first bites (both available at lfs) once a day for the first 4 days. Then, I switch to first bites twice a day and milk once.
When they are about 8 days old, I begin adding crushed flaked food in other varieties such as vegie flakes or whatever flakes you will feed them as they grow. I stop using the milk except as more of a treat during the day. Every few days, I try to add some crushed spirulina. I find feeding them a variety of food makes them more healthy.
I change at least 25% of the water on a daily basis and sometimes skip a day. I have a filter running, and also have an air bubbler on a very light stream.
Remember though, no matter how well you take care of these sweeties, you may lose a few or most. I had over 40 guppy fry and 6 molly fry in a 10 gallon and did this feeding schedule. No matter what I did, the guppy fry dropped. I only have about 5 or 6 left, but everyone figures it is due to the inbreeding. Also, they are very susceptible to disease. It is sad to lose them, but keep in mind you might. I would love to have updates on how well they are doing.