Mother cat might not have enough milk, or the kittens might have died because of an illness, prematurity, or a genetic problem. The important thing now is to try to save the other kitten.
If there is a pet shop nearby, get a bottle and kitten formula right away. Hold the kitten upright, and if it has problems nursing, squeeze the bottle very gently. Also check to see if any milk is coming out or the bottle. Don't make the hole in the nipple too big, or you could choke the kitten.
If the pet shop is a distance away, get someone there asap, and give the kitten a bit of homemade formula with a dropper. Make sure the dropper is clean. Even a clean fingertip will do in an emergency. Be careful not to choke the kitten by feeding too fast. The milk could get in its lungs.
Make some emergency formula (enough to feed the kitten until you get the kitten formula) with half canned milk, half water, and a bit of white Karo. and a bit of raw egg yolk. (1 can milk, 1 can water, 1 tablespoon Karo, 1 beaten egg yolk) If someone is bringing kitten milk, just make a small amount. The kitten formula is better.
Let mother cat wash the baby or gently massage its tummy and bottom with warm water to encourage digestion.
I hope the kitten makes it
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden