31. Babies Yawn Before They Are Born
Few things have the “aww” factor quite as much as watching a newborn baby yawn. However, that first yawn that the parents see is not the child’s first; babies begin yawning in-utero. In 4-D resonance scans of fetuses, scientists previously believed that the babies were opening their mouths.
Nevertheless, in a study released back in 2012, scientists discovered that the babies were yawning. In fact, fetus yawns are twice as common as when they open their mouths. The yawns decrease in frequency after 28 weeks of gestation, which is about seven months into pregnancy.