Feeding their trains

Violet and Calvin's favorite thing to do lately is play with their train set. I was sitting on the floor playing with them the other day, and I noticed Calvin picked up a train, lifted up his shirt, and lift it up to his chest....and told me he was feeding his train. Violet did the same thing...and soon they found it funny to "breastfeed" their trains. So silly, that one made me laugh. They copy everything I do!