Yawning is considered a social behavior. While fetuses were known to yawn, scientists weren’t sure if it was a self-contained reflex or if they could somehow detect cues from their moms Laboratory experiments involving pregnant mothers suggests they can spread yawns to their soon-to-be-born offspring in the womb. Pixabay Yawning is a highly  contagious  behavior. Stand next to someone who sleepily opens their mouth to take a deep breath, and, within a matter of seconds, you’ll likely find yourself doing the same. Now, new research suggests even fetuses are not immune to the catchy power of a yawn. Laboratory experiments involving pregnant women suggest they can spread yawns to their soon-to-be-born offspring, researchers report in a study published May 5 in the journal  Current Biology . Scientists have long known that fetuses yawn, even though they cannot yet use their lungs to breathe.…