Unexpected Babies!!?

Welcome to platys! they breed like rabbits. Your female platy will probably give birth to more fry every couple of months. I used to scoop up my fry and put them in a nursery net within the main tank because wether or not mum platy gave birth to them or not she will eat them! Crumpled up flake food is ok to give them but you can buy special liqui fry food to give them in the first week if you cant get to a pet shop you can make your own by par boiling a couple of potatoes put them in a jar add some tank water and leave for a couple of days then just feed a few drops of that 4-5 times a day. Your fry should reach adult size within 3 months but they will be big enough to go into the main tank in about 3-4 weeks, you really need to judge that by yourself just make sure that they are big enough not to fit in a mouth. also if i was you id buy gilbert a mate as platys are usually great fish for a community but they are best kept in pairs. good luck!