PregnancyOnline version Pregnancy by Marina BR 1 Group 1 2 Group 2 3 Group 3 4 Group 4 5 Group 5 Fertilisation A sperm joins an ovum. First three months The embryo becomes a foetus. Limbs and organs start to grow. Second three months Face starts to form. The foetus has all its organs. Last three months The foetus is developed and ready to be born. Birth The baby is born after nine months