I've found a page that explains the cuteness appeal of babies and baby animals: http://www.cerebromente.org.br/n15/curiosidades/filhote_i.html
They list these features (below) that attract us to the babies. And, frankly, if you are gonna get plastic surgery, these are some appealing features you should shoot for. Imagine walking down the street and having people go, "OH MY GOD---LOOK AT THAT GUY! I MUST PET HIM!"
1. A larger size of the head in relation to the rest of the body;
2. A rounded skull and salient front;
3. Big eyes, placed below the middle line of the skull;
4. Round and oversized cheeks, small nose;
5. Short, chubby and rounded members.
Look at this cool chart (from the website) that shows the cute differences in babies over adults:
Baby animals usually reach maximum cuteness when fur is acquired. So while they are still really cute as newborns---gotta be careful not to be eaten by even your own mom at this point:
But before a baby panda knows it, he's furry, he's gloriously fat, and he's rolling around being so cute that an on-looker's eyes will bleed:
What goes thru the mind of something so cute? I don't know. I do know that I wish I could get my hands on a baby panda: