YouTube's Ms. Rachel takes on first words and potty training in new books

When Rachel Accurso's son developed a speech delay, the former teacher made it her mission to help her child learn how to speak. 

Now better known as Ms. Rachel, she transformed her living room into a YouTube studio and began creating educational videos. They took off and she is now a YouTube phenomenon that has reached billions of children worldwide. 

"When he had a speech delay, I really got interested in language development and how I could use media to help with language development," Accurso told "CBS Mornings."