I was in the same situation with my platies. Except I had 9 babies. lol If no one has eaten them and they are getting food, keep them in there.
As a tip, you should chrush up the flakes you feed them so the babies can get some food too. I crush mine up anyway, since the guppies like it that way. :P
10 Gallon Tank:
~Countless Pond Snails~1 Espe's Rasbora~1 Harlequin Rasbora~
5 and 5.5 Gallon Tanks:
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Many of my scaly friends from my original tank from 2011 have passed, except for two! I am in the process of re-doing my tank. :)