IBAN: IT36M0708677020000000008016 - BIC/SWIFT:
ICRAITRRU60 - VALERIO DI STEFANO or
Common Birth Defects
12CHAPTER
119
TYPES OF BIRTH DEFECTS
One out of every 100 or so babies is born with some kind of obvious defect or
deformity. There are many different types. In this chapter we describe a few of the
most common: cleft lip and cleft palate, extra or joined fingers or toes, and short,
missing, or deformed limbs. We also discuss children born with multiple contractures
(arthrogryposis). Please also refer to the chapters on club feet (Chapter 11), and spina
bifida (Chapter 22).
CAUSES
In many cases, the cause of a birth defect is not known. But
sometimes a defect may be caused by one of the following:
• Poor nutrition during early pregnancy. This is thought to be one cause
of cleft lip and palate.
• Genetic (hereditary). Sometimes certain defects run in families.
For example, if one parent was born with an extra thumb, there is
a greater chance that a child will be born with a similar defect.
One or both parents may be ‘carriers’ of the factor that causes a
defect, without having it themselves. However, it may be present
in relatives. Often both parents must have a ‘defect factor’ for a
child to be born with the defect. For this reason, birth defects are
more common in children whose parents are closely related, and
who therefore carry the same defect factors.
• Medicines, pesticides, chemicals, and poisons. Especially during
the first 3 months of development, a baby in the womb can
easily be harmed by chemicals and poisons. Many medicines,
drugs, and pesticides (plant, insect, and rat poisons) can cause
birth defects if a pregnant mother is exposed to them.
• German measles. If the mother gets German measles during
the first 3 months of pregnancy, it can cause defects in the
baby. These usually affect the senses (hearing and seeing), the
brain (cerebral palsy and mental slowness), or organs inside
the body (heart, liver). Sometimes the baby is born
with ‘rubber band-like’ grooves on the limbs
and deformed or missing fingers or limbs.
• Children born to mothers 40 years of age or older are more
likely to have Down syndrome and defects of the hands, feet,
or organs inside the body (heart, liver). In this age group, about
1 mother in 50 will have a child born with Down syndrome or
defects.
For ways to prevent birth defects, see p. 124.
The mother of this
girl with cleft lip
and palate did
not get enough to
eat while she was
pregnant.
A doctor gave
this boy’s mother
a medicine for
‘morning sickness’.
This boy’s mother
was 45 years old
when he was born.
Static
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