If you have trouble with her aspirating the formula try the flow control human baby bottles(yes the nipple is big, but its usually small enough for kittens a couple weeks old. I have used them for week old chihuahua puppies that were signed over to my work that had aspirate pnemonia.) Otherwise make sure you feed her belly down like she would suck from the mama.. Dont hold her on her back when feeding her its easier for them to aspitate the milk into her lungs. Hold her upright and burp her after by lightly tapping her back. You have to poop/pee her using a warm wet cotton ball after for the first few weeks until she can go on her own. At that point use a cardboard flat that canned food comes out of (low top so she can get in easily) and put kitty litter in there(ETA: Non-clumpin kitty litter! They will try and taste it and you dont want it forming a big clump in her belly!), The instinct to bury their feces is there, they just need a little encouragement. Puppy pads are also your best friend! and the biggest one of them all If she has teeth she can eat from a bowl! usually at about 3 weeks you can mix the formula with a little kitten canned food. I mix it and feed it from the bottle so they can get the taste of the canned then switch to a bowl and slowly add more canned food and less formual. If you have ANY questions you can PM me. I have done tons of bottle babies(had 8 last spring), and I tech at an emergency vet.