I was recently watching a rerun of America's Funniest Home Videos. A grandfather had his 18 month old grandson sitting on his lap. He put him through his paces. Next, his grandfather asked him what his dad did. Perhaps a little gross, but it proves my point.
Children are great imitators.
I once observed a six year old walking behind his father in deep snow. He strained mightily as he put his tiny foot in his dad's gigantic footprint and then leaped to the next footprint. Yes, children are great imitators. They simply copy what they see. They do what they see, they speak what they hear.