You won't be aware of your developing baby's activities inside the uterus for some months yet, but the fact that his elbows are forming allows him to make some small movements; the wrists do not yet move.
Your baby is looking more human by the day. His vertebrae and ribs are now in place, and his fingers are gradually lengthening. His body is less curled up than it was a few weeks ago.
The skeleton will gradually calcify and harden. With the exception of the cranial skull bones, all your baby's bones have a soft cartilage core that will later be reabsorbed as it is converted into hard bone. This process of hardening, known as ossification, starts in so-called primary ossification centers during the next five weeks of your pregnancy. Within these primary centers, specialized cells form spongy then hard bone as calcium salts are laid down. Within the hard bone is red bone marrow, which in later weeks will become the main producer of the baby's red blood cells.
Secondary ossification centers develop in the second trimester at the ends of each of your baby's bones.
The portion of bone between the hardening primary and secondary centers is known as the growth plate. This plate is responsible for the continued lengthening of your unborn baby's bones.
If being pregnant gets you down at times, try a dietary boost. Happy, relaxed people tend to have high levels of serotonin, a brain chemical that is produced when you consume protein-rich foods. So eat meat (especially turkey), fish (see Know your fish), legumes, and well-cooked eggs (see What to avoid).
Eating foods that are rich in vitamin B, such as bananas and avocados, can also help increase your serotonin levels.
It is a common myth that eating cheese harms the unborn baby. Only unpasteurized cheeses are potentially dangerous because they increase the risk of listeria (a rare bacterium that can attack the baby). These products may be produced at local cheese stores or dairy farms.
All other types of cheeses pose no danger and are regarded as a good source of calcium.
So, while there are some cheeses you should avoid eating, you can enjoy all of the following, if they're pasteurized:
Excerpted from Pregnancy Day by Day.
Copyright ©2009 Dorling Kindersley Limited.
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