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Midline submental ultrasound image of an infant’s oral cavity during non-nutritive sucking. The tongue is in a superior position and the maternal nipple rests at the deepest curvature of the hard palate (area of palatal depth). When nutritive sucks are performed, the nipple increases in volume and reaches up to 2.7 ± 1.0 mm to the hard-soft palate junction (HSPJ).
