Male humping females at age of 2 months old

The "humping", particularly at this age but as a rule, does not necessarily indicate a sexual act. It is the dogs' way of creating leadership in the pack, and dogs are very social and very hierarchal, so it makes sense one of them tries to be more dominant than the other.

Make sure you neuter and spade when the time is right, and I suggest you let them at it.  

he's showing the female dog who is the "alpha" or top dog

It's nothing sexual! The male is trying to establish dominance over the female. Is your male neutered? If not, getting him neutered would help with the humping.

Spay and Neuter... thats all I can say. After that, they can do what they want, the she dog isnt going to get hurt. Usually, as everyone says, the male is just telling the female that he is the leader.

This is typical behavior among puppies. It's all about dominance. Ignore it and it will pass.

Its a dominance trait, I have yorkies too and my female humps the largest male to show him who is boss. It was incredibly funny at the time she kept jumping on his head!!! But we ignored it and she seems to have stopped doing it since she was spayed!!!