>are specifically evolved to be cute
Wrong. Animals have adapted to find attributes of being a toddler cute. Because if you find your toddler qt you will take better care for it and it has a better chance to transport your genes to the next generation, thus reinforcing this behavior.
Small limbs, big foreheda and big eyes make complete sense for a body that is growing up fast. They don't have adapted to be this way in order to be viewed differently.
Momma bird will probably find its offspring cute as well.