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You don't need to give grit until you start giving treats. The chick starter has everything needed in it. Some may disagree, but I wouldn't be in any hurry to give "treats". They need to fill up on the nourishing chick starter. Giving chicks treats is sorta like giving your young children candy, cookies, coke and ice cream, etc. They love you for it, but is it good for them to fill up on that rather than something nutritous?
As far as the "babying" them, when chicks are hatched by the mother hen, they can run around in cool or cold weather some, then run under Mom to warm up. But in the wild, hens don't hatch chicks in winter. With babies in a brooder with no mama hen, they should have 95 degrees their first week, (provided by a light bulb, and before putting the chicks in the brooder, lay a thermometer under the light to make sure it gets to 95, but not a lot more. Use a smaller bulb for less heat, if it gets too hot.) And have the bulb at one end of your brooder so they can get away from the heat if needed. They will know, even at day one, how to get to their comfort zone. If they are all huddled under the light bulb, you need a little bigger bulb, and if all are as far away from the light as they can get, it is too large. They need 5 degrees less of heat each week, (but they can adjust this themselves by moving further away from the bulb) till the temp in the brooder is lowered to the lowest temp outside at night, if you are going to put them into an unheated coop outside. When they are 8 or so weeks old, they should be feathered out enough they won't need additional heat provided, especially if it is warm spring or summer.
25 if a fine number if you will have an outside coop and pen for them when they get bigger. The small numbers is just what most in the city get, because they have only a yard, so don't have room for a large chicken pen and coop. If you have the room, and want lots of eggs for your family, neighbors, or to sell, etc. the amount doesn't matter. Good Luck.