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Fetal size: Length, 1/6 to 1/4 of an inch, crown to rump. Weight, still too small to measure.
Fetal development milestones: This week the babies are registering fetal heartbeats. Blood is pumping through their hearts. There are now two distinct amniotic sacs and the twins' heads, legs, and umbilical cords are forming.
What you're seeing: Although this may not look like much, these circles show two distinct gestational sacs -- twins! With a single pregnancy, only one sac would appear on the screen. Here, the sonographer (ultrasound technician) has identified each baby-to-be, one marked AA, the other BB. Most expectant mothers receive several ultrasounds during a twin pregnancy to ensure that both babies are growing properly and the pregnancy is progressing normally. Your unborn babies will grow at the same rate as with a single pregnancy -- but times two.
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