1) Baby pacifiers 2) Nursery soothers 1) Croons 
unaccompanied songs sung to comfort babies or lull them to sleep. Virtually all cultural groups have lullabies, which are often passed on quite unconsciously from one generation of parents to another. Lullaby lyrics are often nonsensical and repetitive. The melodies are simple and smooth to produce the desired effect of getting a fussy baby to slee...