Germinal: Weeks 0 - 2, Fertilisation, Implantation, Zygote, Placenta created, Embryonic: Weeks 3 - 8, Vulnerable to teratogens, Cell differentiation, Brain & spinal cord develops, Most organ systems have been created, Foetal: Weeks 9 - 40, Sex organs identifiable, Movement occurs, Senses begin to function, Organ systems fully mature,

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