Pregnant or not

Question
I just recently bought some fish for my daughter. I have 4 Mickey Mouse Platies and 4 Black Mollie. I think that one of the Mickey Mouse Platies might be pregnant. How do I tell if it is a female 1st of all? How do I tell that a platy is pregnant? What do I need to do for a pregnant platy? (ie care, birth, fry) Will the black Mollies eat the Mickey Mouse Platy fry?

Answer
Hello Erica!
great question! male platys ,molly,sword tails and guppies can all be sexed by look. females are more round and their anal fins have a round flat look while males are slender and anal fins are thin and can straighten its self in any direction.
if your Mickey  mouse platy is pregnant look at her gravid spot(located just above the anal fin) if its turning brown and big shes pregnant and will deliver anywhere between 3 to 5 weeks.
when shes is around 3 and a half weeks pregnant buy a breeder box/net and place her in once shes at 4 weeks.
platy tend to eat their young so the box is better in this case.
leave the fry in the box or net and feed pulverized flakes, baby brine shrimp, or fry first feed you can find at any pet store.
since they are free swimming they will eat straight away.
leave in the net or box until they're too big to fit in any of your platys or Mollies mouths and then set free.
make sure non are getting eaten and if you see they are fine then just leave them be and feed regularly.
best of luck!
Chris