At the end of Game of Thrones S8E4, before
Arya kills the Night King,
we see all of the of the White Walkers gathered.
Where was the baby White Walker that the Night King created earlier in the show?
Do they grow up super fast? Was he left behind? If so then with whom and where?
Furthermore, we know that the baby Crastor sends isn't the first, does that mean some (or all???) of the other White Walkers are his sons as well?