Lately my girls have been laying like crazy, I only have 4 laying hens at the moment, the rest are babies. I got 7 eggs this morning from 4 chickens. I think it's too many for them to be laying at any given day, I don't want one to get a prolapsed vent. All the eegs have rock hard shells, the birds are healthy and their vents all look fine. Is there ways on slowing down my girls laying at all?