Yes, Renesmee can have a baby,all vampires can, but it's illegal in the vampire world. If she has a child that's a vampire the volturi would find out and he or she would be destroyed.mAnd if it's a human baby she can live peacefully as a human. So Renesmee CAN have a baby.
It's unknown. None of the other half-vampires (Nahuel's sisters) are revealed to have had children, but it isn't confirmed that they haven't either. Since she will age until she reaches maturity, it's likely that she could get pregnant at that age, but she might freeze like a normal vampire woman afterwards. The fact that she got imprinted upon also suggests that she could conceive, since all the theories about why werewolves imprint are about passing on the werewolf gene to the next generation.
yes of course because shes half human. vampires cant have babies with each other because the female vampire cannot carry babies (eg rosalie) but bella and edward could because bella was human and was able to carry renesmee
Yes, she has blood and cells in her veins. Unlike vampires she can have babies. Vampires are dead and cant carry a baby. That is why they made immortal children, to fill a void. The only reason Renesmee was born was because Bella was still human.
Possibly because she is half human and Jacob is a werewolf but Renesmee is also half vampire so because of the werewolf and vampire blood together they might cancel each other out which would make the child fully human or it could make a very lethal creature given how strong, agile and angry they can be separately. What ever the case you can't really find out by looking at Edward and Bella because one was full human and the other was full vampire so it depends.