RicketsFamilial Hypophosphatemic RicketsHypophosphatemia, FamilialInfant, PrematureInfant, NewbornPHEX Phosphate Regulating Neutral EndopeptidaseInfant, Premature, DiseasesInfant CareInfant FoodOsteomalaciaSodium-Phosphate Cotransporter Proteins, Type IIcInfant FormulaInfant BehaviorHypophosphatemiaGenetic Diseases, X-LinkedInfant, Newborn, DiseasesRickets, HypophosphatemicInfant MortalitySudden Infant DeathInfant Nutritional Physiological PhenomenaInfant, Low Birth WeightVitamin D DeficiencyHypocalcemiaHypercalciuriaVitamin DInfant, Very Low Birth WeightHydroxycholecalciferolsBreast FeedingPhosphorusPhosphatesInfant Nutrition DisordersInfant, Extremely Low Birth WeightAlkaline Phosphatase25-Hydroxyvitamin D 2NephrocalcinosisInfant WelfareCalcitriolErgocalciferolsCholecalciferolChild DevelopmentMilk, Human25-Hydroxyvitamin D3 1-alpha-HydroxylaseFanconi SyndromeGestational AgeReceptors, CalcitriolPregnancyCod Liver OilMicroradiographyInfant, Extremely PrematureInfant, Small for Gestational AgeCalcification, PhysiologicBottle FeedingLionsFibroblast Growth FactorsSunlightCalcium, DietaryGenu ValgumBirth WeightDihydroxycholecalciferolsCystinosis