For infants: Lean back slightly (about 30 degrees) while resting your child's belly against your chest. Hold your child around the bottom to keep them steady. With the other arm, gently clap (percuss) between the spine and shoulder blade of the upper back. Clap for 1 to 3 minutes, depending on how much your child needs. Repeat on the other side of the spine.

For toddlers and older: Have your child lean forward slightly (about 30 degrees) on a pillow. Gently clap between the spine and shoulder blade of the upper back. Clap for 3 to 5 minutes. Repeat on the other side of the spine.