I found an orphan newborn kitten a week ago. I've been feeding it kitten formula and she seems to be healthy. Though today she's making noise, it sounds like purring, though I'm worried if she has milk in her lungs? I've been feeding her the correct way, and making sure she's warm and also help her pee and poo. She's moving a lot but I'm just worried. She doesn't make that noise when I hold her, she only makes the noise when she wants to cry :/..
Also, when she cries, her voice isn't how it used to.. it sounds more low and you could hardly hear it.
The mother cat's purr serves as a vibration-beacon that tells her blind and deaf newborn kittens her location. Kittens begin to purr back by two days of age. She is probably just purring , lightly touch her neck when she is doing this .. do you feel her purring in her neck or do you feel the vibration in her chest? if her neck is vibrating she is purring but honestly if you're concerned or scared than always safe than sorry .. take her into your vet or speak with him/her on the phone for advice.