The infant's uncle, 33-year-old Miguel Angel Tellez, allegedly used a milk jug full of gasoline to try to light his barbecue. He was arrested on felony charges of child endangerment and unlawfully causing a fire.
When he threw fuel on the fire, it exploded, setting the jug on fire and spewing flames on the baby girl, who was sitting in her stroller a few feet away.
Firefighters got the call and rushed to the scene.
"She had burns in her legs, approximately 21 percent, possibly second-degree burns," said Anaheim Batt. Chief Tim Butler.
Tellez was held on $100,000 bail.
Despite her critical injuries, authorities said the girl will survive.