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Your 18th Week

You'll find you're gaining weight week by week, which is perfectly normal.

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18 week fetus in uterus Your uterus is likely to be large enough to give you a noticeably rounded belly.The sex oragans are developing well, both externally and internally.Your baby is now bigger than the placenta for the first timeAt 18 weeks the average crown to rump length is 4.6 inThe placenta is still growingThe baby's movements are getting more vigorous

Not all the weight you're gaining is your baby. In fact, most of the increase is because parts of your body, such as your breasts, are getting bigger and your blood volume is increasing. You might want to think about signing up for prenatal classes now because they fill up quickly. They are a great source of information, as well as a good way to make friends and compare notes with other pregnant women.

Excerpted from Pregnancy Day by Day.
Copyright © 2009 Dorling Kindersley Limited.
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