As the only person I know that knows about Twilight, I have a bizarre and strange question. I am sorry.

Question: in twilight, can 2 vampires have a child together? What about a vampire and a human? If they can have a child, will the child age?

With regrets,

-⚙️

No need to apologize! Fortunately for you, book 4 (breaking dawn) spends a significant amount of time answering these exact questions in canon!!

Can 2 vampires have a child together? No. The body needs to change to accommodate a baby/pregnancy, and vampire bodies are incapable of change. If it was possible, Rosalie would've found a way

Can a vampire and a human have a child? Yes, certain pairings! If the human is capable of getting pregnant, and the vampire is capable of impregnating (which just means they were capable of impregnating as a human), then a vampire can impregnate a human. This is how Edward and Bella have a kid together, Renesmee :)

Will the child age? Yes, and this is a big problem in book 4. A vampire-human hybrid will age rapidly, pregnancy lasting about a month, and then speeding through human developmental milestone and stages, reaching physical maturity in 7 years (they're born with an adult mental capacity). At that point, however, the speed tapers off and they remain unchanging and immortal like a vampire--though they are not identical to vampires; their human attributes do affect them. For example: only male hybrids are venomous, their skin isn't as sparkly and then can blend in in sunlight, they have circulatory systems and normal eye colors, and they can live off both blood and human food. However, they are incredibly fast and strong like vampires, and smarter than any human.

Hybrids are, however, incredibly rare. It takes significant self restraint for a vampire to impregnant a human without losing control and feeding on them--and very very few (2 people) are even willing or motivated to try. And of 5 known hybrids, only 1 has been birthed without killing her mother (they have a habit of bursting through the stomach and feeding on their carrier); in order to survive, the carrier must be turned into a vampire as well, as there's simply no other way to survive the injuries of the birth.

And to be clear: a vampire-human hybrid is very different from an immortal child. An immortal child is a human child transformed the traditional way via venom, which completely freezes them in time as an unchanging child. This is highly illegal because immortal children cannot develop past their transformation age, cannot mature, and yet have all the strength and power of a normal vampire, making them incapable of protecting the secrecy of vampire existence. Imagine a toddler who can level entire villages with a temper tantrum. The technical age of a child in this situation is iffy, but I'd say generally 10 and below is bad.

I hope that helps with whatever you need to info for!