title: Formal swimming lessons must be defined.
authors.forename: William David
authors.initials: WD
authors.lastname: Carr
mesh_terms: D002648:Child; D002675:Child, Preschool; D004332:Drowning / Q000517:prevention & control*; D006801:Humans; D007223:Infant; D013550:Swimming / Q000193:education*; D013663:Teaching / Q000379:methods*; D014481:United States