Fine motor abilities of infants.
D002657:Child Development; D005106:Exploratory Behavior; D005260:Female; D014644:Genetic Variation; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D009048:Motor Skills; D013997:Time Factors; D014743:Videotape Recording