Young females usually just have a few babies at a time, but as they get older and have more batches, they can have dozens at a time. Also, they store sperm so that they can have a batch of babies about every 30 days several times, all from just one coupling!
Between 5-10 babies. .
First time when they are young they have between 1 and 20 after that they can have up to 60 at a time :) Mines just popped out 10 an hour ago :)
They can have as low as one to as high as 12
22
My black molly had about 10 babies at once