What is the right guitar to get my 3 year old nephew?

My girlfriend( future wife) ask me to get her nephew something a while back, she told me he like the guitar, so I have been looking for the perfect one for him but I don't think i can find the right guitar that is age appropriate. The little boy is 3 going on four. I saw this elmo guitar, but to be honest, it look too young for him. I know i am gonna get him a little elmo doll, but i need to find the right guitar, can someone help me