Are babies cute? No one knows for sure! It seems a little odd that all other mammal babies are objectively cuter than human babies, which means that if anyone isn’t cute, it’s us.
It doesn’t help that human babies stay that way for such a long time. I’m pretty sure I would get sick of a puppy if it wasn’t fully grown until 16-20 years later. It probably wouldn’t improve matters if the puppy couldn’t move on its own for a year, required constant attention, and might grow up to hate you.
Basically what I’m saying is that when someone says “That human baby is so cute!” they very likely mean that it’s cuter than an adult. Also they might be an alien reptile for going out of their way to specify “human.”