Not all kittens die that early on. If the kitten hasnt got a mother or a owner looking after it that may be the reason why. It may not be getting enough to eat or if it's a outdoor cat it may be too cold.
The mother cat gives birth to the kittens.
milk
She felt that her kittens would be safer there.
Kittens need their mother's milk for at least 8 weeks.The answer to your question is yes.
Kittens naturally get goop in their eyes; you just need to keep wiping their tear ducts regularly. If the goop seems exessive, take the kittens to a vet.
After about a week.
It is probably teething. Give it something else to chew on.
Call the fire department .
Yes, if mama cat is comfortable witgh you, there shouldn't be a problem touching the kittens. But don't forget, 1 week old kitten haven't opened their eyes yet so they need their mother very much, so try to handle them too much.
Mom cats often adopt another cat's litter, especially if the mom recently gave birth. For young kittens, that's okay BUT mom will need more food with protein (e.g. a good dry and wet food). However, 12-week old kittens should NOT be nursing. Separate the older kittens from their "adopted" mom and get them onto dry food.
Kittens generally spend 16 to 18 hrs a day sleeping.
Well, you should bring it to the vet. They will give you the bast answer.