causes significant deformities in arms, legs and less frequently to ears, kidneys, the heart and genitals.
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Teratogens
are external substances that negatively affect foetal development.
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Fetal alcohol syndrome (FAS)
Abnormal growth and facial characteristics and impairment in at least three areas of functioning, such as communication, social skills, planning and reasoning and memory
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**Embryo:**
Weeks 3-8 of the 1st trimester. Internal and external structures of the body form
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**Germinal period:**
A two week period, and is the first stage of the 1st trimester. A one celled zygote multiples while other structures form
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**Foetus Weeks 9-12**.
rapid growth period, nervous system, organs and muscles become organised.
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**Foetus Weeks 13-24**
is when foetal movements become detectable, and most neurons are in place, and the foetus reacts to both sound and light.
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In 3rd trimester, (weeks 25-38)
the lungs of the foetus mature, and there is a rapid increase in size. Additionally, there is rapid brain development and behavioural capacities
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