@roger,
Roger, Baby mammals have certain similar characteristics that we've come to recognize as childhood. (Some of the following comes from an article on the Internet: What is neoteny, or, why are baby animals cute? MaryEllen Schoeman)
For example, disproportionately large eyes and/or heads (both of which are seen in baby humans, for example), limbs out of proportion to the body (long and delicate, like foals, or baby deer; or short and stumpy, like puppies and kittens), and blunted/non-threatening snouts and ears in the case of predatory mammals.
Excessive fuzziness is also characteristic of almost all mammal young, and serves different functions in different animals.