A study on the development of some motor phenomena in infancy.
D002657:Child Development; D005260:Female; D006257:Head; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008124:Locomotion; D008297:Male; D009043:Motor Activity; D009048:Motor Skills; D013216:Reflex, Startle; D014836:Volition