I'm babysitting my nephew and he's constipated? What can I give him?

Believe it or not, Dr.Pepper helps! They used to prescribe it to constipated patients! And it tastes yummy! He'll love it! For the two year old, put a TV show he likes on demand or a channel like Nick Jr. Put him in a bedroom with a TV, do what i just said, turn off the lights, close the windows and door, tuck him in, and sit on the floor until he falls asleep