Infant BehaviorTemperamentCryingSucking BehaviorInfant, PrematureInfant CareInfant, NewbornMother-Child RelationsMaternal BehaviorObject AttachmentChild DevelopmentChild BehaviorInfant, Premature, DiseasesInfant FoodMothersInfant FormulaInfant MortalitySudden Infant DeathInfant, Newborn, DiseasesBehavior, AnimalInfant Nutritional Physiological PhenomenaInfant, Very Low Birth WeightInfant, Low Birth WeightFeeding BehaviorBreast FeedingInfant WelfareSocial BehaviorInfant, Extremely Low Birth WeightPregnancyHealth BehaviorMilk, HumanBehaviorGestational AgeChild Behavior DisordersInfant, Extremely PrematureInfant, Small for Gestational AgeBottle FeedingSexual BehaviorBirth WeightSexual Behavior, AnimalIntensive Care Units, NeonatalExploratory BehaviorAdolescent BehaviorProblem SolvingBehavior TherapyDevelopmental DisabilitiesTime FactorsInfant Nutrition DisordersRisk FactorsRespiratory Distress Syndrome, NewbornInfectious Disease Transmission, VerticalBronchopulmonary DysplasiaQuestionnaires