The French-speaking priest is heard saying it's a "tantrum" and that he will pour water on his head so he will become a "little Christian".
In the clip a woman, presumably the baby's mother, holds the child while the priest speaks in French and taps the baby's forehead.
The priest got irritated and was speaking loudly, in a bid to raise his voice over the screams.
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According to People, a Reddit user who originally uploaded the footage said the priest was French.
Naturally, the power of Christ only compelled the child cry louder, eventually prompting a man (presumably his father) to yank the boy away from the priest's almighty grasp.
A disturbing video has emerged of a priest slapping a baby across the face as he administers baptism.
The baby can be seen crying as the family hands him over to the priest.
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He grows frustrated and slaps the baby in his face. "I was trying to calm him down; I didn't really know what to do".
After the clergyman slapped the struggling child, the distressed relatives grabbed their baby.
"I wonder how many millions of kids suffer inappropriately aged "discipline" like this behind the scenes in religious families who believe this is biblically sanctioned, though", One woman wrote.
It's unclear whether the priest has been charged or if further action was taken by the child's parents.
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