SAN ANTONIO—A mother being held as a minor in state custody from a polygamist sect gave birth Monday to a baby boy immediately taken into child-protective custody as the state acknowledges the mother may be an adult.

The boy is the second baby born in state custody since Texas child welfare officials raided the sect’s ranch in West Texas April 3.

The mother has been in state custody, treated as a minor, since last month. CPS spokesman Patrick Crimmins acknowledged Monday she is among 27 girls whose age is in dispute.

Crimmins said officials were reviewing documentation of the mother and others who claim they are over age and will release them from state custody if they are adults. He said he doesn’t know how long it will take to determine whether their claims of adulthood are legitimate.

But Rod Parker, an attorney and spokesman for the Fundamentalist Church of Jesus Christ of Latter Day Saints, accused the state of deliberately holding a pregnant mother it knew was over age so it could take the baby into custody upon its birth.

“They just wanted to keep the mother in custody until they could get the baby,” Parker said.

But Crimmins said the FLDS members gave conflicting information about their names and ages, so sect members whose ages were in dispute were kept in custody.

“We didn’t have documentation. The other thing, too, frankly is the information we got ... changed over time,” he said.

The new mother has claimed she is 22 and has filed a writ of habeas corpus to be freed from state custody; the state contends she is a minor.

The newborn was immediately placed in state custody, bringing the total number of children taken from members of the renegade Mormon sect to 465.

He’ll likely stay in state custody even if his mother is an adult. Like other mothers of children under one year, she’d be allowed to stay with him in a foster-care facility, Crimmins said.

Child welfare officials and state troopers raided the FLDS’s Yearning For Zion Ranch in Eldorado beginning April 3 after a domestic violence shelter received calls from a girl who purported to be an abused 16-year-old. The girl has never been found and authorities are investigating whether the calls were a hoax.

But the state took custody of all the ranch’s children, saying the sect’s practice of underage and polygamous spiritual marriages endangered the children there.