BRECKENRIDGE, Texas—A premature baby was found alive between a mattress and door several days after a teenage mother gave birth, hid the infant there and went on a trip, police said.

The baby girl was found Saturday morning after the teen’s younger sister heard faint cries coming from a bedroom, opened the door and found a newborn completely wrapped in two towels between a mattress and bathroom door, said Breckenridge Police Chief Larry Mahan. Lauren Renee McDonald, 19, of Breckenridge, was charged with child abandonment and endangerment after she returned from her trip on Sunday. McDonald has since been released from jail on $10,000 bond.