In the early days of pregnancy, before the placenta becomes functional, how does my baby get nutrients?

Before the placental circulation starts properly (about 10 weeks), fluids and nutrients diffuse through the cells around the baby to provide what the baby needs. Then, over the space of a few days, the placental blood vessels open up and the circulation suddenly begins with the developing baby''s circulation being bathed in the mother''s blood through a simple membrane (like a kidney dialysis machine) in the placenta that separates baby''s from mother''s blood.
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