Id asked the question before about my baby kitty which is 12hrs old i have a another one?

now the mother that gave birth is still weak and having trouble breathing i have to put her down tomorrow now i wanna keep the kitten i have been feeding it with a syringe its been taking to it great ive been putting a warm cloth on its bum area and its peeing and pooping now with out the mother can the baby still surive ????if so what should i do to make it feel like the mother is in the box ?? and th kitten was born with only 3 legs im keeping it and wanna do my best for the little one bec its the last thing i have to remind me of my cat which i had since i was 6