Where the bastocyst divides into two (4 days after conception) where one becomes the baby and the other forms into various structures that support development e.g. placenta, umbilical cord, yolk sac, amnion
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Card 18
Front
All major organs/systems begin to develop (Organogenesis) e.g. heart beat at 4 week gestation
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Card 19
Front
Basic structures are refined and grow to final form. By week 12, the sex can be determined. Viability is possible by week 22/23
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Card 20
Front
From 20th week, the brain's weight increases 10 fold and the neurons begin forming synapses at a rapid pace. This brain growth means new behavioural capacities
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Card 21
Front
An agent or factor that causes malformation of an embryo
