A woman in Arkansas is pregnant with two babies -- but not twins. When she went in for a routine ultrasound, doctors discovered that Julia Grovenburg had a second fetus, a male, growing alongside her first, a female, according to ABC News.
This extremely rare medical condition is known as superfetation and occurs when a woman conceives a second child when she's already pregnant. “When the woman had her ultrasound initially, they saw one sack, one baby developing, and that baby had a certain gestational age; then they noticed a second heartbeat in a child that was much, much younger developmentally,” Karen Boyle, M.D., of the Greater Baltimore Medical Center, told ABC News.
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