The core development of your baby's central nervous system has taken place, and it will now progress further using four overlapping processes. The number of nerve cells increases and their positions alter during migration-a process by which cells move to their final locations and develop specific functions. The connections between individual nerve cells become more organized, and the fibers become insulated. The growth of the nervous system now enters its most active phase. Reflecting this, the head accounts for half of the entire length of the baby. Both the nerves and their supporting cells increase in number. Although most of the nerve cells are produced during pregnancy, the supporting cells continue to increase in number during your baby's first year. The supporting cells assist in the migration process, which is largely completed by 22 weeks.
There's no reason why not if you were a regular runner before you became pregnant, but take it easy-now is not the time to run a marathon!
You need to avoid becoming overheated so don't run on hot days and drink plenty of water, regardless of the temperature. Wear a good sports bra to support your growing breasts. Whenever you can, run on soft surfaces, such as grass, to reduce the stress on your joints, especially your knees.
Jogging is a good aerobic activity during pregnancy in the early months, but is only advised if you're used to jogging. Don't take it up as a new activity in pregnancy.
Pork is an excellent source of protein, vitamin B6, and zinc-which are all essential nutrients for pregnancy. Pork has a reputation as a fatty meat, but this is not deserved; it is probably due to the fact that some cuts can be fatty, such as spare ribs, bacon, and ham, but many cuts of pork have less saturated fat than beef.
The key to eating healthily is to look for the leanest cuts. These usually have the word "loin" in the name, such as tenderloin or top loin chop. A serving of pork should be approximately 3 oz (85 g).
Pork is healthy and delicious, and quick and easy to prepare. Sprinkle some salt on lean pork chops, grill, and serve with some apple sauce on the side; your craving for something both salty and sweet can be met in a healthy way. Always make sure that the pork is prepared on a separate cutting board than other foods and thoroughly cooked to reduce your chances of getting a food-borne illness (see Cooking with care).
Excerpted from Pregnancy Day by Day.
Copyright © 2008 Dorling Kindersley Limited.
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