Babies' sleeping habits.
D001903:Bottle Feeding; D001942:Breast Feeding; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009772:Obstetrical Forceps; D010298:Parity; D011247:Pregnancy; D012890:Sleep; D012959:Socioeconomic Factors; D014851:Wakefulness