Tongue moves up and down with lower lip and mandible6
Lateral edges of tongue cup to form gutter29
Non-nutritive suck and true suck, see liquid loss6
Sucks on objects or hand when they make contact with the mouth6, 29
Suckling, tongue moves forward, backward, strokes nipple19, 29
Engages in non-nutritive suckling or sucking when object comes into contact with mouth; attempts to focus on speaker's face