Sibling's influence

With the existence of a big sister, Peter is really doing something special for his age.

Ball throwing---At the end of 7 to eight months, Peter was able to really "throw" a ball to others, while in Yaya's case, she was not able to do it until over 1 year old, if i remember right.

Pen holding---Recently, Yaya writes and draws a lot at home, therefore we got her a desk. Whenever Peter sees his big sister holding a pen, Peter will somehow make me understand that he wants one too. Then, he will use the pen to imitate Yaya and try to leave something either on the wall or floor. It was until after Yaya's third birthday when we confirmed that she was left-handed, since she didn't really do as much pen-holding before two. But in the case of Peter, I am pretty sure he will be right-handed, since he is now already consistantly using his right hand to hold the pen.