Here is a bunch of very cute animal photos. Why are they cute? Well, acording to some sources, cuteness is all about proportion. For example, a baby is about 3 baby heads tall, whereas adults have a smaller head relative to the rest of their bodies; an adult is about 7 adult heads high.
It doesn't necessarily has to mean that if something is cute has different proportions overall, but one point lies in that as well.
by @crosport