Three pregnant women have been arrested for prostitution after advertising their services on Craig's List.

According to Kansas City's KMBC News Station, the women featured their pregnancies as part of their ads.

One of the women is three-months pregnant, another is six months and the third is eight-months pregnant. Another woman was arrested as well, but it is not known whether she is pregnant.

Police were tipped off that the women, whose ages ranged from 18-22, were advertising themselves as escorts on the popular website. Authorities set up a sting operation, calling the women and arranging a meeting. The girls were arrested when they came to meet the undercover police officers.

Three of the women were released, and another was held on outstanding charges.