Six pint-sized perps – two of them only 13 – were busted in a violent knifepoint robbery of a straphanger inside a Midtown subway station early Tuesday, cops and sources said.

The three boys and three girls approached the 35-year-old victim, a stranger, on the N/R/W train platform at Fifth Avenue/59th Street around 3:15 a.m., according to authorities and sources.

One of the boys flashed a knife before grabbing the victim’s iPhone and a bag of clothes he’d been carrying, cops said. 3

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A female accomplice punched him in the face during the early-morning mugging, police said.

The youthful ruffians fled out onto the street after the attack – but weren’t on the run for long before cops caught up to them, sources said.

The boys, 13, 14 and 16, were taken into custody, alongside the

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