Kelmanson, I A Environmental characteristics and sleep in two-month-old infants. [electronic resource] - Klinische Padiatrie - 259-63 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0300-8630 Standard No.: 10.1055/s-2004-44903 doi Subjects--Topical Terms: Apgar ScoreBirth WeightEnvironmentFemaleGestational AgeHumansInfantInfant BehaviorInfant CareMaleMaternal AgeSex FactorsSleep--physiologySocial EnvironmentSurveys and QuestionnairesTime Factors