Montgomery County Fire and Rescue Service spokesman Pete Piringer said crews responded to a medical emergency on southbound Interstate 270 between Route 118 and Middlebrook Road around 8 p.m.
As first responders were taking the pregnant woman to the hospital, she gave birth inside an ambulance.
The child and the parents are expected to be OK.
Below is a map of the area near the incident.
Like WTOP on Facebook and follow @WTOP on Twitter to engage in conversation about this article and others.
© 2019 WTOP. All Rights Reserved. This website is not intended for users located within the European Economic Area.
