Physical Development Learn About the various stages of Physical Development. Baby Bathing & Skin CareBreastfeedingCrying & ColicDiapers & ClothingFormula FeedingNutritionPreemieSleepTeething & Tooth Care Toddler FitnessNutritionPotty Training Preschool Nutrition & Fitness Teen Dating & SexFitnessNutritionDriving SafetySchoolSubstance Use Young Adult HealthyChildren.org