To make the sign for friend, hold out both of your index fingers hooked in a curved or 'C'-like shape. Holding one hand with your hook index facing up, hook the second index into the first. Then reverse the position for the hands and do it again. It is like your fingers are best friends and giving each other a hug.
Make the friend sign when reintroducing your baby to one of their similar age playmates. "It's your friend, Sally."
This is one of the most important signs and is quite helpful in pointing our babies toward being able to communicate emotional connections. If your baby attends play groups, teach him or her the word for friend early on.