Rest in Peace Little Itty Bitty Kitty.
My 19 yr old daughter, Lexie found an abandoned baby kitten. There were two of them on the edge of the parking lot, but only this one survived. Since Lexie's cat had kittens 3 weeks prior, she took the baby kitten home and added it to the litter.
The mama cat licked it and nursed it and let it join the family, but she didn't give it the extra care it needed as a newborn. She was treating it like the older kitties. He wasn't getting enough nursing nor enough snuggling, so Lexie bottle fed it and kept it snuggled safe and warm.
When Lexie was at work, we babysat the kitten. That was fun!
He lived for ten days under Lexie's care. One day his eye puffed up and was infected. Two days later, he wasn't feeling well. Meowing and not taking his bottle. She took him to the vet. While she was waiting to be seen, the kitten died in her hands. The vet couldn't believe she had kept him alive at all. Apparently, the kitten was premature and didn't have a chance.