Sports Nutritional Physiological Phenomena: Nutritional physiology related to EXERCISE or ATHLETIC PERFORMANCE.Elder Nutritional Physiological Phenomena: Nutritional physiology of adults aged 65 years of age and older.Infant Nutritional Physiological Phenomena: Nutritional physiology of children from birth to 2 years of age.Dental Physiological Phenomena: Physiological processes and properties of the DENTITION.Digestive System and Oral Physiological Phenomena: Properties and processes of the DIGESTIVE SYSTEM and DENTITION as a whole or of any of its parts.Reproductive and Urinary Physiological Phenomena: Physiology of the human and animal body, male or female, in the processes and characteristics of REPRODUCTION and the URINARY TRACT.Musculoskeletal and Neural Physiological Phenomena: Properties, and processes of the MUSCULOSKELETAL SYSTEM and the NERVOUS SYSTEM or their parts.Circulatory and Respiratory Physiological Phenomena: Functional processes and properties characteristic of the BLOOD; CARDIOVASCULAR SYSTEM; and RESPIRATORY SYSTEM.Integumentary System Physiological Phenomena: The properties and relationships and biological processes that characterize the nature and function of the SKIN and its appendages.Reproductive Physiological Phenomena: Physiological processes, factors, properties and characteristics pertaining to REPRODUCTION.Physiological Phenomena: The functions and properties of living organisms, including both the physical and chemical factors and processes, supporting life in single- or multi-cell organisms from their origin through the progression of life.Adolescent Nutritional Physiological Phenomena: Nutritional physiology of children aged 13-18 years.Prenatal Nutritional Physiological Phenomena: Nutrition of FEMALE during PREGNANCY.Urinary Tract Physiological Phenomena: Properties, functions, and processes of the URINARY TRACT as a whole or of any of its parts.Maternal Nutritional Physiological Phenomena: Nutrition of a mother which affects the health of the FETUS and INFANT as well as herself.Child Nutritional Physiological Phenomena: Nutritional physiology of children aged 2-12 years.Infant, Premature: A human infant born before 37 weeks of GESTATION.Nutritional Physiological Phenomena: The processes and properties of living organisms by which they take in and balance the use of nutritive materials for energy, heat production, or building material for the growth, maintenance, or repair of tissues and the nutritive properties of FOOD.Musculoskeletal Physiological Phenomena: Processes and properties of the MUSCULOSKELETAL SYSTEM.Infant, Newborn: An infant during the first month after birth.Virus Physiological Phenomena: Biological properties, processes, and activities of VIRUSES.Infant, Premature, DiseasesInfant Care: Care of infants in the home or institution.Infant Food: Food processed and manufactured for the nutritional health of children in their first year of life.Animal Nutritional Physiological Phenomena: Nutritional physiology of animals.Digestive System Physiological Phenomena: Properties and processes of the DIGESTIVE SYSTEM as a whole or of any of its parts.Infant Formula: Liquid formulations for the nutrition of infants that can substitute for BREAST MILK.Infant Behavior: Any observable response or action of a neonate or infant up through the age of 23 months.Blood Physiological Phenomena: Physiological processes and properties of the BLOOD.Infant Mortality: Postnatal deaths from BIRTH to 365 days after birth in a given population. Postneonatal mortality represents deaths between 28 days and 365 days after birth (as defined by National Center for Health Statistics). Neonatal mortality represents deaths from birth to 27 days after birth.Sudden Infant Death: The abrupt and unexplained death of an apparently healthy infant under one year of age, remaining unexplained after a thorough case investigation, including performance of a complete autopsy, examination of the death scene, and review of the clinical history. (Pediatr Pathol 1991 Sep-Oct;11(5):677-84)Infant, Newborn, Diseases: Diseases of newborn infants present at birth (congenital) or developing within the first month of birth. It does not include hereditary diseases not manifesting at birth or within the first 30 days of life nor does it include inborn errors of metabolism. Both HEREDITARY DISEASES and METABOLISM, INBORN ERRORS are available as general concepts.Ocular Physiological Phenomena: Processes and properties of the EYE as a whole or of any of its parts.Nervous System Physiological Phenomena: Characteristic properties and processes of the NERVOUS SYSTEM as a whole or with reference to the peripheral or the CENTRAL NERVOUS SYSTEM.Infant, Very Low Birth Weight: An infant whose weight at birth is less than 1500 grams (3.3 lbs), regardless of gestational age.Respiratory Physiological Phenomena: Physiological processes and properties of the RESPIRATORY SYSTEM as a whole or of any of its parts.Infant, Low Birth Weight: An infant having a birth weight of 2500 gm. (5.5 lb.) or less but INFANT, VERY LOW BIRTH WEIGHT is available for infants having a birth weight of 1500 grams (3.3 lb.) or less.Cell Physiological Phenomena: Cellular processes, properties, and characteristics.Skin Physiological Phenomena: The functions of the skin in the human and animal body. It includes the pigmentation of the skin.Plant Physiological Phenomena: The physiological processes, properties, and states characteristic of plants.Bacterial Physiological Phenomena: Physiological processes and properties of BACTERIA.Breast Feeding: The nursing of an infant at the breast.Infant Welfare: Organized efforts by communities or organizations to improve the health and well-being of infants.Cardiovascular Physiological Phenomena: Processes and properties of the CARDIOVASCULAR SYSTEM as a whole or of any of its parts.Infant, Extremely Low Birth Weight: An infant whose weight at birth is less than 1000 grams (2.2 lbs), regardless of GESTATIONAL AGE.Child Development: The continuous sequential physiological and psychological maturing of an individual from birth up to but not including ADOLESCENCE.Pregnancy: The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.Milk, HumanGestational Age: The age of the conceptus, beginning from the time of FERTILIZATION. In clinical obstetrics, the gestational age is often estimated as the time from the last day of the last MENSTRUATION which is about 2 weeks before OVULATION and fertilization.Infant, Extremely Premature: A human infant born before 28 weeks of GESTATION.Infant, Small for Gestational Age: An infant having a birth weight lower than expected for its gestational age.Bottle Feeding: Use of nursing bottles for feeding. Applies to humans and animals.