Are you my Mother??

Do you all remember reading that book to your kid's? Well, a baby bird must have fell out of the nest or tried to fly too soon and is now stuck on the ground in my backyard. Every time I get close to him the Mama birds start squawking louder and louder. The baby got scared and "tried" to squeeze through the fence. It obviously did not work :)
I know nothing about birds but I sure would like to help this little guy that has fallen from his nest. Any suggestions??