“Camden, I’m so proud of you buddy.”

Texas mother Kate Whiddon said that to her son, who was born without arms and legs, in a heartwarming video that has gone viral. It features her 4-year-old son, Camden, walking for the first time.

According to People magazine, Whiddon, 23, learned that her son didn’t have arms or legs when she was just 18 weeks pregnant. He was diagnosed with amelia-phocomelia after his birth.