Babies? Well, depends if they learned to talk yet. >_>

Cats and Dogs? Perhaps. My Dog smells my Crotch alot, so I guess thats his way of saying "Hello!".

My Cat licks me...alot.

If Cats lick you, it usually means they want you to stop doing something. When they meow, they want you to do something. Licks can also be kisses, apparently. o_O