I have 5 day old baby chicks and was told at the feed store that they don't need grit until they're done eating their starter. But mypetchicken.com, where I got the chicks, says to give them grit. Any advice? Thank you! P.S. I have been giving them a few bugs to eat (they go crazy trying to catch them) as well as tiny pieces of clover and grass, which they don't seem to really eat, but just peck at.