Complex Brain Surgery News Today

After 34 weeks of pregnancy, the team of doctors decided to perform surgery on the babys brain in the womb itself.

>> this next story is really incredible. a 3-year-old boy, hearing his fathers voice for the very first time in his life. thats why it is our "favorite story of the day." >> after undergoing experimental procedure, the hearing impaired toddler has a remarkable moment all captured on tape. abcs david muir has the story. >> reporter: this is the moment so many people are talking about, grayson clamp, 3 years old had never heard his father before. >> grayson. >> talk to him, daddy. >> daddy loves y...