Advice on breeding mex rosys

I've had a male mex rosy for about 3 years, and finding an adult female to pair him up with has been extremely difficult. After getting lucky at a show in oct., i finally got one, and she a little bigger than he is. The day i put her in his cage, that happy little guy must have mated with her at least 5 times! Everytime i checked on them, they were gettin it on! I've bred balls before, but this is my first time with live-bearers. How long for gestation, and what about post-natal care for the babies? She also has a voracious appetite.