KANSAS CITY, MO (KTRK) -- Kansas City Police arrested a suspected shoplifter after her baby fell out of an alleged getaway car.Witnesses say the suspects were speeding away from a Target store when the infant tumbled out of the back door of a car.Steven Duke and his wife Lori were leaving the store Thursday morning when two women with their arms full of clothing ran out behind them and jumped into a waiting car. Duke said the car sped away and took a sharp left turn. He said that's when the back door flew open and one of the suspected shoplifters and a baby were thrown from the car.The driver and the baby's mom kept going, Duke said."I think about 4 months old," said Lori Duke. "Obviously not strapped into a car seat. She probably rolled 30 feet. That's not something I can wrap my mind around and to see them just continue to drive away... how is that even possible?"Duke used to be a Kansas City police officer and is now a nurse. He says the suspect grabbed the baby and started to take off which was something he was not going to let happen."We went and chased her down because I didn't want that baby getting away without medical attention and I was afraid that was what was going to happen," said Steven Duke.Duke held the suspect and handed the baby to his wife. The baby had a cut on her head, scrapes all over, was covered in urine and was lethargic."That was worrying me because she wasn't crying," said Duke.Duke says after 15 minutes the baby's mother finally came back and was demanding to see her baby. Instead, she was arrested as were two other suspects.The baby was taken to a hospital in serious condition.