Intraindividual variability of infants' behaviour.
D000367:Age Factors; D002652:Child Behavior; D002940:Circadian Rhythm; D005149:Facial Expression; D005247:Feeding Behavior; D005386:Fingersucking; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009043:Motor Activity; D012890:Sleep; D014851:Wakefulness