The 23- month- old boy is from Amarillo.
His burns were so severe he had to be flown here to Lubbock.
Police say they found out about this incident because the boy's mother was driving him to the hospital when she flagged down an officer at the police station.
She told him the boy was having a seizure and the officer quickly noticed burns on the child's head.
The hospital is not releasing the latest on his condition because of the crime.
The little boy was burned on his face and forehead from some kind of liquid.
Investigators wouldn't specify if the burns were caused by hot water or some other substance.
The mother's boyfriend, Gardea Navarrette, 27, was arrested at a West Amarillo home Wednesday morning.
He's charged with injury to a child and felon in possession of a firearm.
Lieutenant Martin Birkenfeld said the little boy's burns aren't the only thing they're looking into.
"There are also some other injuries that the child has that are unexplained and we're still investigating how the child got those injuries," Lt. Birkenfeld said.
Police say at this point they don't know if the child's injuries were intentional or accidental.
But, that doesn't matter because child injury charges also apply to adults who don't seek medical treatment for injured kids.