Growing up, twins Jessica and Jennifer Patterson said they shared everything, WTHR-TV, Indianapolis, reported.
"Toys," Jessica Patterson said.
"Clothes, toys, food. Everything," Jennifer continued.
The twins, who are currently living together, say they didn't plan to become pregnant at the same time.
"It just happened. It just happened," the 21-year-old sisters both explained.
On Tuesday night, the two went to the hospital for Jessica to be induced.
"I was with her in the hospital room," said Jennifer.
However, Jennifer ended up going into labor. Jessica had a Caesarean section later.
Jessica gave birth to a son, Mason Douglas, and Jennifer had a daughter, Adeline Rose.
"They even look alike," Jessica said of the babies. "I hope they grow up really close."
The new mothers, both single, say they plan on continuing to live together.
"Its gonna be a crazy house," said Jennifer.