Many people think of birth defects as things that happen to other people. They
don't. Birth defects can, and do happen to anyone regardless of age, sex, race, economic
status, or education. Birth defects occur in one out of 28 births. There are about 4000
different birth defects. They are the leading cause of infant death and a major couse of
disability in young people, affecting more than 150, 000 babies each year. There is some
good news though, the rate of infant deaths due to birth defects has been cut in half since
1960. However, despite ongoing research, the causes of about 60 percent of birth defects
are unknown. In the early 1990's, it was discovered that, by taking the B vitamin folic
acid daily women can reduce the risk of having a child with birth defects of the brain and
spinal cord.
Every child born is at risk of birth defects. 1 in 115 births will have heart or
circulation problems. 1 in 130 births will have muscle or skeleton problems. 1 in 135
births will have Renal agenesis, the absence of one or both kidneys. If one kidney is
missing the prognosis is good unless there are other complications. If both kidneys are
absent, death occurs shortly after birth. 1 in 135 births will also experence Uninary
Obstruction, this includes a variety of malformations that obstruct the passage of urine. 1
in every 235 births will have problems with the nervous system, like Cerebral palsy.
Cerebral palsy is any of various non-progressice disorders characterized by inpairment of
voluntary movement, resulting from maldevelpment of the brain of damage to it
prenatally, during birth, or at any time up to the age of about 16 years. This be
accompanied by other abnormalities of the brain functions, such as mental retardation.
Problems with the nervous system may also be Spina bifida. Spina bifida is a
malformation of vertebrae, involving malformation and protrusion of the spinal cord and
spinal nerve roots. The degree of consequent disability depends largely on the extent and
exact location of the spinal cord malformations. 1 in 600 births will have Chromosomal
Syndromes. The most common is Down syndrome. This ia a variable combination of
birth defects including mental retardation and characteristic facial features. About 40
percent of babies with this condition also have congentital heart defects, and many have
some visual and hearing impairment and various other health problems.
What causes birth defects? There are many different things. Some birth defects
can be inherited, just as we inherit other characteristics such as eye color. The hereditary
information is passed from parent to child in genes. Children inherit genes from each
parent. If one parent has the gene for a dominant disorder, the child has a 50 percent
chance of inheriting this gene and developing the disorder. This is know as dominant
inheritance. Sometime defects are due to problems of the chromosomes. Chromosomes
may have undergone changes while they were still in the egg or sperm, or may be
changed by an environmental factor, such as heavy exposure to radiation. Once these
changes occur, they can be passed on to future generations. Birth defects can also be
caused by infections. Rubella (german measles) is probably the best know infectious
disease which can cause birth defects. The virus can cause deafness, heart defects,
blindness, and mental retardation. More common infectons are cytomegalovirus and
toxoplasmosis, a parasitic infection that can be contracted through handling or eating
undercooked meat or contact with cat feces. Both of these infections may cause mental
retardation and other problems. Sexually transmitted diseases also endanger the unborn
and newborn. As a result of untreated syphilis, a child may be born with born
malformations and infection of many body organs. Gonorrhea can cause eye infection