This channel is just about 100% kitten videos, the subjects being my foster kittens. I foster for a local rescue here in Huntsville, Alabama (400+ fostered thus far), and when the kittens are old enough (around 3 months), they are spayed/neutered, vaccinated and adopted out through Forgotten Felines of Huntsville.
(I have heard of spay/neuter. As mentioned, all are spayed/neutered before being adopted out. And yes, those newborn kittens are hissing, so I don't require you to strangersplain how they're not "Well, actually" hissing.)