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At 4 weeks, the embryo is around 2 mm (around the size of a poppy seed) and weighs just 0.01 kg.
At 5 weeks old, your baby is 3 mm (about the size of an apple pip) and weighs 0.02 kg.
At 6 weeks, your baby is 5 mm (about the size of a pea) and weighs 0.03 kg.
At week 7, your baby is 1.2 cm (the size of a blueberry) and weighs 0.05 kg.
By week 8, your baby is about 1.6 cm (the size of a raisin) and weighs 1 g.
At week 9, your baby is 2.4 cm (about the size of a strawberry) and weighs 2 g.