care for baby deer

Does it have spots?

Cook some rice

Cook some rice may sound like a joke but really you're better off euthanizing it.

googled it

goat milk or fawn milk, can find them at Tractor Supply or Walmart.

My uncle had a three deer in a big pen on a few acres. IIRC, he fed them sweet potatoes every now and then as treats as well as other veggies. Idk if said deer has teeth yet though

Corn?

Boy or girl?

well, the answer from wildlife an fisheries would be to tell you to release it and let nature run its course.

I would personally go to the coop and get a baby bottle and then feed it warmed whole milk if you can find it...

You will Have to rub its arse with a warm wet rag to make it use the bathroom.

I saved one that had fallen into deep cable trench. Bottle fed him until he could eat solids. Fed him sliced apples, lettuce and honey suckle after that and he would eat most anything a goat will eat as its gets older.
Here's the kicker. If it doesn't go to the bathroom it can get compacted quickly. You have to dab a warm water rag/sponge or whatever on its arse so it will go. Or just lick it like its mother would do. I opted for the rag but that's just me. Good luck.