Adorable infants show off swimming skills in 'Underwater Babies'

This story was originally published April 7, 2015.

First there were underwater dogs, then underwater puppies. Now, the cute factor has been raised exponentially in "Underwater Babies."

Photographer Seth Casteel is following up his first two books with a look at babies learning how to swim. Casteel worked with swimming schools across the country to showcase little ones ages 4-17 months learning to swim. The babies' underwater expressions are too cute with their chubby cheeks and wide eyes.

Aside from being undeniably adorable, Casteel's photos are also intended to carry an important message -- teaching parents and children about water safety.

PHOTOS: Underwater Puppies

Photos courtesy of Seth Casteel.