Sorry for the ones that didn't make it and I hope you feel better.

I usually lightly dust my babies food every 3rd or 4th feeding (I only feed them fish). Once they get big enough, usually around 3-4 months old I start feeding them 1 day old whole pinks and discontinue dusting their fish.

Some people pop babies after being only a few days old, as for visually sexing them it is significantly unreliable with babies.