I got the impression that platies are real prolific breeders and everyone else has no problem getting theirs to breed. I have 3 females and 1 male and I've yet to see any belly swelling or babies. The male is always a constant companion to one of the girls and chases away the other females. It seems like he's courting her but it's been that way since day 1 and none of them are pregnant. Does it take more time for them to get established and do their thing?