Causes of No Weight Gain During Pregnancy

Most women have no trouble packing on pounds over the course of their pregnancy. Extra food and calories give your baby the nutrients he needs to grow and allow you to build fat stores for breast feeding. Some women struggle to gain weight for a variety of reasons, including morning sickness, severe nausea and struggles with self-image. Discuss concerns about your weight with your obstetrician.

First Trimester Symptoms

Plenty of women fail to gain weight and even lose weight in the first trimester when pregnancy symptoms are most intense. A combination of morning sickness, nausea, exhaustion, heartburn and constipation may keep you from eating much besides crackers and ginger ale. The American Pregnancy Association recommends a gain of 1 to 4.5 pounds in the first trimester, but you can compensate later in the pregnancy if sickness keeps you from gaining weight.

Hyperemesis Gravidarum

portrait of a young pregnant woman getting her weight checked by a doctor

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Some women experience a very severe form of morning sickness called hyperemesis gravidarum, which results in failure to gain weight and can lead to weight loss. Hyperemesis gravidarum is characterized by severe vomiting, nausea that doesn't subside after the first trimester, vomiting that causes dehydration and inability to tolerate any food. The condition is treated with medication, changes to diet and rest. If the vomiting becomes too severe, hospitalization with intravenous fluids and tube feeding may be necessary to prevent dehydration and help with weight gain.

Body Image

In a culture obsessed with thinness, it can be difficult to go through the growth and change in shape that accompanies pregnancy. Women may limit their calorie intake to prevent weight gain in order to "bounce back" faster after pregnancy. Failure to eat properly can seriously harm your baby, so it's important to discuss any self-image issues you may have with your doctor. Let your doctor know if you have a history of anorexia or bulimia so that he can recommend appropriate treatment.

Obesity Issues

portrait of a young pregnant woman getting her weight checked by a doctor

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An increasing percentage of women start their pregnancy overweight or obese. Carrying extra weight increases your risk of complications during pregnancy, including hypertension, gestational diabetes and other health problems. Although the American College of Obstetricians and Gynecologists recommends a gain of between 15 and 25 pounds for overweight women and a gain of no more than 20 pounds for obese women, your obstetrician may advise you to gain no weight at all.