How could obesity affect my baby?
Obesity during pregnancy can cause various health problems for a baby, including:
- Macrosomia. Women who are obese are at increased risk of delivering an infant who is significantly larger than average (macrosomia) and has more body fat than normal. Research suggests that as birth weight increases, so does the risk of childhood obesity.
- Chronic conditions. Being obese during pregnancy might increase the risk that your baby will develop heart disease or diabetes as an adult.
- Birth defects. Research suggests that obesity during pregnancy slightly increases the risk of having a baby who's born with a birth defect.
How much weight should I gain during pregnancy?
Your pre-pregnancy weight and BMI, as well as your health and your baby's health, all play a role in determining how much weight you need to gain during pregnancy. Work with your health care provider to determine what's best in your case and to manage your weight throughout pregnancy.
Start by considering these general guidelines for pregnancy weight gain and obesity:
- Single pregnancy. If you're obese and carrying one baby, the recommended weight gain is 11 to 20 pounds (about 5 to 9 kilograms).
- Multiple pregnancy. If you're obese and carrying twins or multiples, the recommended weight gain is 25 to 42 pounds (about 11 to 19 kilograms).
Still, some research suggests that women who are obese can safely gain less weight than the guidelines recommend. Rather than gaining or losing a specific amount of weight during pregnancy, your health care provider might encourage you to focus on avoiding excessive weight gain during pregnancy.
Will I need specialized care during pregnancy?
If you're obese, your health care provider will closely monitor your pregnancy. Depending on the circumstances, your health care provider might recommend:
- Early testing for gestational diabetes. For women at average risk of gestational diabetes, a screening test called the glucose challenge test is often done between weeks 24 and 28 of pregnancy. If you're obese, your health care provider might recommend the screening test earlier — perhaps even at your first prenatal visit. If your test results are normal, you'll likely repeat the screening test between weeks 24 and 28 of pregnancy. If results are abnormal, you'll need further testing. Your health care provider will advise you on blood sugar monitoring and control.
- Delayed fetal ultrasound. Fetal ultrasound is typically done between weeks 18 and 20 of pregnancy to evaluate a baby's growth and development. Since ultrasound waves don't easily penetrate abdominal fat tissue, however, obesity during pregnancy can interfere with the effectiveness of fetal ultrasound. Ultrasound results might be more detailed if the test is done a few weeks later, such as between weeks 20 and 22 of pregnancy.
- Fetal echocardiography. Your health care provider might recommend a fetal ultrasound that provides a detailed picture of your baby's heart (fetal echocardiography) between weeks 22 and 24 of pregnancy. This test is used to rule out or confirm a congenital heart defect.
- Frequent prenatal visits. As your pregnancy progresses, your health care provider might recommend more frequent prenatal visits to monitor your health and your baby's health. Regular fetal ultrasounds might be recommended to help your health care provider evaluate your baby's growth and plan for your delivery.
What steps can I take to promote a healthy pregnancy?
You can limit the impact of obesity on your pregnancy and ensure your health and your baby's health. For example:
- Schedule a preconception appointment. If you're obese and you're considering getting pregnant, talk to your health care provider. He or she might recommend a daily prenatal vitamin and refer you to other health care providers — such as a registered dietitian or an obesity specialist — who can help you reach a healthy weight before pregnancy.
- Seek regular prenatal care. Prenatal visits can help your health care provider monitor your health and your baby's health. Tell your health care provider about any medical conditions you might have — such as diabetes, high blood pressure or sleep apnea — and discuss what you can do to manage them.
- Eat a healthy diet. Work with your health care provider or a registered dietitian to maintain a healthy diet and avoid excessive weight gain. Keep in mind that during pregnancy, you'll need more folic acid, calcium, iron and other essential nutrients. A daily prenatal vitamin can help fill any gaps. Consult your health care provider if you have special nutritional needs due to a health condition, such as diabetes.
- Be physically active. Consult your health care provider about safe ways to stay physically active during your pregnancy.
- Avoid risky substances. If you smoke, ask your health care provider to help you quit. Alcohol and illicit drugs are off-limits, too. Get your health care provider's OK before you start — or stop — taking any medications or supplements.
Obesity during pregnancy can increase the risk of complications for you and your baby. To ease your anxiety, work closely with your health care provider. He or she can help you avoid excessive weight gain, manage any medical conditions, and monitor your baby's growth and development.
Mar. 27, 2015
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- American College of Obstetricians and Gynecologists (ACOG) Committee on Obstetric Practice. ACOG Committee Opinion No. 549: Obesity in pregnancy. Obstetrics & Gynecology. 2013;121:213.
- Stamnes Koepp UM, et al. Maternal pre-pregnant body mass index, maternal weight change and offspring birthweight. Acta Obstetricia et Gynecologica Scandinavica. 2012;91:243.
- Quinlivan JA, et al. Antenatal dietary interventions in obese pregnant women to restrict gestational weight gain to Institute of Medicine recommendations: A meta-analysis. Obestrics & Gynecology. 2011;118:1395.
- Nuthalapaty FS, et al. The impact of obesity on female fertility and pregnancy. http://www.uptodate.com/home. Accessed March 10, 2015.
- Tse G, et al. Weight gain and loss in pregnancy. http://www.uptodate.com/home. Accessed March 10, 2015.
- Blomberg M. Maternal and neonatal outcomes among obese women with weight gain below the new Institute of Medicine recommendations. Obstetrics & Gynecology. 2011;117:1065.
- Artal R, et al. Weight gain recommendations in pregnancy and the obesity epidemic. Obstetrics & Gynecology. 2010;115:152.
- Gunatilake RP, et al. Obesity and pregnancy: Clinical management of the obese gravida. American Journal of Obstetrics & Gynecology. 2011;204:106.
- Committee to Reexamine IOM Pregnancy Weight Guidelines, Food and Nutrition Board, and Board on Children, Youth and Families. Weight gain during pregnancy: Reexamining the guidelines. Institute of Medicine and National Research Council. http://www.nap.edu. Accessed March 10, 2015.
- Staying healthy and safe. U.S. Department of Health and Human Services Office on Women's Health. http://womenshealth.gov/pregnancy/you-are-pregnant/staying-healthy-safe.html. Accessed March 10, 2015.
- Loret de Mola JR. Obesity and its relationship to infertility in men and women. Obstetrics and Gynecology Clinics of North America. 2009;36:336.
- Pasquali R, et al. Obesity and infertility. Current Opinion in Endocrinology, Diabetes and Obesity. 2007;14:482.
- Bellver J, et al. Obesity and poor reproductive outcome: The potential role of the endometrium. Fertility and Sterility. 2007;88:446.
- Baardman ME, et al. Combined adverse effects of maternal smoking and high body mass index on heart development in offspring: Evidence for interaction? Heart. 2012;98:474.
- Fetal dystocia. The Merck Manual Professional Edition. http://www.merckmanuals.com/professional/print/gynecology_and_obstetrics/abnormalities_and_complications_of_labor_and_delivery/fetal_dystocia.html. Accessed March 10, 2015.
- Catalano PM. Management of obesity in pregnancy. Obstetrics and Gynecology. 2007;109:419.
- Davies GAL, et al. SOGC Clinical Practice Guidelines No. 239: Obesity in pregnancy. International Journal of Gynecology and Obstetrics. 2010;110:167.
- Aviram A, et al. Maternal obesity: Implications for pregnancy outcome and long-term risks — A link to maternal nutrition. International Journal of Gynecology and Obstetrics. 2011;115:S6.
- Routine prenatal care. Bloomington, Minn.: Institute for Clinical Systems Improvement. http://www.icsi.org/guidelines_and_more/gl_os_prot/womens_health/prenatal_care_4/prenatal_care__routine__3.html. Accessed March 10, 2015.
- Defining overweight and obesity. Centers for Disease Control and Prevention. http://www.cdc.gov/obesity/defining.html. Accessed March 10, 2015.
- American College of Obstetricians and Gynecologists (ACOG) Committee on Obstetric Practice. ACOG Committee Opinion No. 548: Weight gain during pregnancy. Obstetrics & Gynecology. 2013;121:210.