7 train rider in vile baby-fondle

A SICKO straphanger grabbed an infant girl’s behind in a subway car as she was being breast-fed by her mother, officials said Sunday.

Antonio Guarchaj, 42, allegedly approached a 39-year-old woman and her 10-month-old daughter on a Manhattan-bound 7 train in Queens about 1:15 p.m. Saturday.

Guarchaj touched the infant’s feet and then walked away. He returned, asking the child’s name — and allegedly stuck his hand up the baby’s skirt and squeezed her buttocks, sources said.

Guarchaj was arrested at the 52nd St.-Roosevelt Ave. stop.

Cops charged Guarchaj with forcible touching, sex abuse, harassment and endangering the welfare of a child.

The Corona resident was arraigned Sunday and held in place of $1,000 bail, records show.

Contact information for his lawyer wasn’t immediately available.

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