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.

Is it true that if I don't feel the baby move more than ten times per day there is a problem?
This is my first pregnancy; how do I know if the baby is moving?
My midwife says the baby feels small but the scan shows it''s a normal size. Who is right?
Three weeks ago, I had an ultrasound saying that I was 7 weeks. I should now be 10 weeks, but on the scan today my baby is measuring 14 weeks. Could an ultrasound be that wrong?
What protects the baby inside the womb-is it the amniotic fluid?
At what stage of pregnancy does the placenta embed itself in the uterine lining?
How soon in pregnancy can you hear the baby's heartbeat?

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

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

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