Second, standing for long periods of time will result in pooling of blood in your lower legs. Along with an increase in swelling of your feet and ankles, you may feel light-headed or faint. Try to intersperse prolonged standing with walking or sitting, and wear good support hose to minimize retaining fluid in your legs. (When I was pregnant and had to stand for long periods of time I found wearing pressure-graded support hose was a life-saver.)
Finally, your faintness may be caused by low blood sugar. Your body continuously utilizes calories to nourish your growing baby, whether or not you eat regularly. This can result in low blood sugar. Try to eat frequent meals throughout the day, and include a source of complex carbohydrates (such as whole grain breads or cereal) at each meal to keep your blood sugar in a normal range for many hours. If you do feel faint, drink some juice or eat a piece of fruit to give your blood sugar an immediate boost.
If you feel faint frequently, discuss this with your doctor. He/she may recommend a blood test to see if you are anemic, and may wish to evaluate you for other causes of fainting.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.