Ultrasounds of a marmoset in the womb show that fetal face and mouth movements (left) are similar to an infant’s contact call (right), suggesting that the fetus develops the motor skills to make its cries before it’s born and can produce sound.
Read more: https://www.sciencenews.org/article/baby-marmoset-cry-vocalization-womb-practice-ultrasound
Video: Developmental Neuromechanics and Communication Lab/Princeton University