I have three baby peachicks that are 4 days old. They are in a secure pen with their mama peahean. The floor of the pen is dirt covered with hay. I feed them all chick starter and some scrambled eggs. At this stage do the chicks and mama need grit? I have crushed oyster shell that I give my adult birds but the pieces are too big for the baby peachicks. So, if they need grit at this stage what do I give them?