IMO, just b/c "they say" grit is not needed if the chicks are only on chick starter... that doesn't mean that grit is not a healthy part of the diet for a chick. I give my chicks a clump of sod as soon as they are eating and drinking well, and demonstrating that their crops are filling. At that time, I'm comfortable putting them on shavings. I've found that the minute they get on shavings, they are scratching through the shavings and eating little bits of it. Therefore, I want them to have some grit before or around that time. The sod accomplishes multiple purposes: It contains bacteria that help them to populate their guts with a healthy flora. It contains grit. It satisfies their urge to scratch and dust bathe. There may be some little bugs lurking in there! And it contains green growing things that they can eat. I used to put it in a container in the brooder. I now toss it right into the shavings. A bit of soil in the shavings is a good thing IMO.