WTNH reports that the baby was found inside of a dumpster by a maintenance worker around 2 p.m. Monday. The child suffered severe burns on both of her hands.
The baby was taken to the hospital in stable condition.
New Haven police arrested 24-year-old Andiana Velez, who they believe was the infant's babysitter.
Investigators said Velez assaulted the baby's 21-year-old mother earlier in the day before abandoning the infant in the dumpster.
Velez is charged with risk of injury to a child, assault and reckless endangerment.
She is being held on $250,000 bond, police said.