title: Murky definitions, missing data prevent meaningful conclusions.
authors.affiliation: La Leche League International.
authors.forename: Linda J
authors.initials: LJ
authors.lastname: Smith
authors.forename: Diane
authors.initials: D
authors.lastname: Wiessinger
authors.forename: Diana
authors.initials: D
authors.lastname: West
authors.forename: Teresa
authors.initials: T
authors.lastname: Pittman
mesh_terms: D005260:Female; D006801:Humans; D007226:Infant Mortality; D008297:Male; D011187:Posture; D012890:Sleep