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Video grab: The baby’s mother argues loudly with another woman at the end of the bus before throwing her toddler girl at another passenger to hold while she runs get into a fistfight with the woman.

The angry woman is seen screaming at her rival for more than 90 seconds — with her tiny girl placidly sitting in her lap — before she roughly tosses the infant into the arms of a stranger across the aisle.

She then runs down to the end of the bus and launches into a vicious attack on her nemesis, who was apparently annoyed over a relationship a relative of the mom had with her own boyfriend.

The ugly scene was caught on a cell phone camera by a fellow bus traveler in Connecticut.

It’s not known when the footage was filmed. Neither woman has been identified.