Vocal, facial and other bodily behaviors that are often interpreted as signs of distress, and which in early infancy is often accompanied by characteristic patterns of movement and posture. An interesting, and as yet unresolved issue, is whether the non-vocal components of crying (e.g., facial movements) develop prenatally in the human.
See Behavioral state, Colic, Crying peak, Fundamental frequency (F₀), Fussing, Larynx, Graded signal, Pharynx, Posture, Reflexive (vegetative) vocalizations, Vagus (or pneumogastric) nerve