Birth cohort
Birth cohort: A group of people born during a particular period or year.
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- Birth control
Birth control is the use of any practices, methods, or devices to prevent pregnancy from occurring in a sexually active woman. Also referred to as family planning, pregnancy prevention, fertility control, or contraception; birth control methods are designed either to prevent fertilization of an egg or implantation of a fertilized egg in the uterus. Birth […]
- Birth defect
Birth defect: Any defect present in a baby at birth, irrespective of whether the defect is caused by a genetic factor or by prenatal events that are not genetic. Birth defects may involve many different organs including the brain, heart, lungs, liver, bones, and intestinal tract. These defects can occur for many reasons including inherited […]
- Birth defects, study of
Birth defects, study of: The study of birth defects is now usually called dysmorphology. Dysmorphology is a term coined by Dr. David W. Smith in the 1960’s to describe the study of human congenital malformations (birth defects), particularly those affecting the morphology (the anatomy) of the individual. Dysmorphology literally mean, “the study of abnormal form.” […]
- Birth rate
Birth rate: The birth rate is usually given as the number of live births divided by the average population (or the population at midyear). This is termed the crude birth rate. In 1995, for example, the crude birth rate per 1,000 population was 14 in the United States, 16.9 in Australia, etc.
- Birthmark
A persistent visible mark on the skin that is evident at birth or shortly thereafter. A birthmark is often due to a nevus (a mole) or an hemangioma (a localized collection of small blood vessels). Birthmarks that are pink or red are commonly capillary hemangiomas — collections of tiny blood vessels — that are most […]