I do the same as Neil, I group feed & let them eat as much as they want. I leave the food in for a couple/few hours until there's a tiny bit of food left and everyone is ignoring the food dish. A few piggies will sausage out but most will just eat a normal amount. I double check on the smallest ones to make sure they have a full belly. If they don't I'll separate those ones into their own container to eat a meal and go back in with their siblings. I haven't had any that I have had to do this more than one time to. I also usually just feed the babies chopped worms & fish, if it was pinkies I would regulate it more.