Having kids is a gift. But this is one of these kinds of knowledge that once you know you immediately can't explain to others who don't.
Each one's a reverse-lottery-ticket, though. Get the wrong draw and it's not a gift. Can easily massively reduce the QOL for everyone around, including other siblings. Mostly due to chronic illnesses, of either the physical or mental variety.
This is a very difficult subject since there exists un-imaginable suffering and it's hard to reconcile that. That life is a gift under the umbrella of un-imaginable suffering. Perhaps, that's what spirituality tries to do, I don't know.