An infant was injured in a fall while his family hiked the trail on Cowles Mountain Wednesday.
A San Diego Fire-Rescue firefighter carried the 4-month old boy down the trail to a waiting ambulance.
The boy's mother tripped on a rock while walking down the trail just after 8:30 a.m. She fell forward but was able to protect the baby, according to the woman's daughter.
She appeared able to walk but with some assistance as she walked down the trail surrounded by firefighters.
The boy's sister told NBC 7 the baby suffered a cut on his head.
Cowles Mountain is a popular hiking trail within Mission Trails Regional Park, one of the largest urban parks in the country.
The peak of the mountain is at 1,597 feet and the trail can be a challenging one in the heat of the day.
The temperature at 8 a.m. Wednesday was approximately 75 degrees and by 9 a.m., the temperature was closer to 79 degrees, according to the NBC 7 Weather Team.