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Hello, my name is***** and I'd like to help. Do you have the ability to weigh this little one on a kitchen scale? Is it old enough that it's ears are open?
They will not take anything but a kitten bottle until they are at least 4-5 weeks old, so this one may be young enough that you will have to go to Petsmart and purchase a nursing kit and KMR (kitten mild replacer).
In the immediate, place a few drops of karo syrup or honey on it's gums, as if it's not eating, they get low blood sugar very quickly!
I do a lot of work with my local animal shelter, so we see a lot of these very young kittens. Typically, when their mother has abandoned them, they can have an illness or have a problem they were born with that the mother doesn't think they will survive. I always warn our bottle baby fosters that these kittens are super fragile and even if you do everything right, they don't always survive, so please just be prepared for that.
Once you have put a few drops of honey or syrup on the gums, please get back to me with an update on how the kitten is doing.
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