It's the fact we're the same species.
On average humans value animals more than animals do their own kind, often their own blood.
When you talk about babies you're missing the point and being shortsighted. Babies develop, and when they're young and vulnerable they need to be protected and taken care of. They hold our future, and thus are incredibly valuable.
And it's not like babies are "bad" or anything. They're sensitive, and thus many stupid, irresponsible parents think them selfish, but they're sweet and cute, and some toddlers can surprise you with such empathy and compassion you would think was beyond capability of any human being. And goodness is the highest criteria any human can be measured by in my book.








