Article 1 Bayley Scales of Infant Development 1 Female 1 Gestures 1 Humans 1 Infant 1 Infant, Extremely Premature 1 Infant, Newborn 1 Language Development 1 Longitudinal Studies 1 MacArthur Competence Assessment Male 1 Mother-Child Relations 1 Motor Skills 1 Object exploration 1 Play and Playthings 1 Preterm infants 1 Vocal production 1 Word comprehension 1 brain function 1 child development 1 clinical article 1 clinical assessment 1 clinical evaluation 1 cognition 1 communication skill 1 comprehension 1 conditioning 1 controlled study 1 descriptive research 1