A Reddit user posted video that shows a priest slapping a baby during a baptism.
After attempting to console the crying child, the priest tries a different approach and slaps him across the cheek.
The horrified parents are at first anxious when the priest holds the baby in a vice-like grip to stop him from wailing.
The child's relatives still appear to be smiling as the priest brings the baby's head towards his, but the baby reacts badly and flails its right arm towards the woman.
The shocked congregation can be heard to gasp at the strike from the priest and the scene that was unravelling in front of them.
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In a 40-second clip that has gone viral, the French-speaking clergyman lashes out in frustration during the ceremony as the tiny child is held by a woman thought to be his mother.
Warning: This video contains violent content that may be disturbing and upsetting to some viewers. I will spill water on the forehead, hmm?
The priest got irritated and was speaking loudly, in a bid to raise his voice over the screams.
Eventually, the man believed to be the boy's father, yanks the boy away as the video cuts out.
No further details have been revealed about the family or whether or not the parents pressed charges for the priest's actions, nor has any representative from the Catholic Church released a statement regarding the priests behaviour.