Phoenix woman, 31, charged after second child with underage father: Police

PHOENIX (KTXL/CNN) -- A 31-year-old woman gives birth to her second child, conceived by a minor teenage boy.

On June 5, Danielle Grace Ruiz, 31, gave birth to a baby with marijuana in his system at St. Joseph's Medical Center. The Arizona Department of Child Safety investigated and found out the baby's father was 16-years-old, despite his birthdate listed on the birth certificate showing him to be 18-years-old.

When the father was questioned, he reportedly told police that he has two children with Ruiz, including the newborn.

Based on the first child's age, investigators realized the father was 14 at the time of conception.

Ruiz allegedly told police that when she was pregnant with her first child, she was told the father was almost 18 years old. Police say Ruiz took a photo of his Social Security card, but never followed up to find out his actual age.

Ruiz has been charged with sexual conduct with a minor.