Cooper Kilmartin, 5, smiles with excitement as his father, Chad Kilmartin, helps him get ready for skiing at Shawnee Peak on Feb, 2. Cooper is learning to ski in a sit ski with the help of his dad. Cooper is unable to move the lower part of his legs because he was born with spina bifida, a condition that occurs when the spine and spinal cord do not form properly.

Chad Kilmartin and Cooper take a short break from skiing with Cooper's mom, Kara, and sister Delilah, 6 months old, while skiing at Shawnee Peak.

Kara Kilmartin gives her husband Chad Kilmartin a kiss after Chad and Cooper skied a run at Shawn Peak in Bridgton.

Chad Kilmartin pushes Cooper, 5, up a hill toward a ski lift at Shawnee Peak.

Chad and Cooper Kilmartin ride the lift at Shawnee Peak.

Chad and Cooper Kilmartin ski together at Shawnee Peak. Cooper 5, skies using a sit ski.

Chad and Cooper Kilmartin ski together at Shawnee Peak.

Kara Kilmartin holding her daughter Delilah, 6 months old, reacts as Chad and Cooper Kilmartin come to the bottom of the mountain after a run at Shawnee Peak.

Chad Kilmartin helps his son Cooper into a sleeping bag for warmth on his sit-ski before heading onto the slopes at Shawnee Peak.