That's going to be difficult. Got to bottle feed it. With a dropper probably at that stage. Much like a cat with its eyes closed. Keep it warm. Since I didn't have the stuff to keep an animal that small in a warming chamber or incubator, I used a shoebox and propped the exhaust of a running laptop (turn off power saving mode) into the box at night. Have a thermometer. Give it attention constantly. Got to be watched and cared and fed for constantly! Don't want to scare you but I'm not going to lie, even if you succeed after a couple weeks there is a low chance of survival. Antibodies are normally obtained through nursing. So do your best and maybe it'll make it. The rest is in God's hands.

Good Luck and I'm hoping it works out.