A newborn baby boy was found abandoned – with his umbilical cord still attached – outside a luxury Chelsea condo building and under the iconic High Line park on Thursday, authorities said.

Two doormen from the HL23 building on West 23rd Street near 10th Avenue found the naked child at the base of a High Line support beam around 3:15 a.m. and flagged down an EMS unit from Station 7, just across the street, according to cops and sources.

One EMS worker jumped into action and treated the baby inside the station before the child was taken to Bellevue Hospital conscious and alert, with no apparent injuries, cops and sources said.

The child’s mother had just given birth to the baby around 2 a.m., sources said.

She was taken into custody, with charges still pending by the late morning, according to the sources.

The state’s Abandoned Infant Protection Act permits a parent to leave an infant up to 30 days old at a “suitable location” — including a hospital or staffed police or fire station — without being prosecuted.

The parent must promptly notify an “appropriate person” of the child’s location.

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