Pregnancy and obesity: Know the risks
Concerned about pregnancy and obesity? Understand the risks of obesity during pregnancy — plus steps to promote a healthy pregnancy.
By Mayo Clinic Staff
Being obese during pregnancy can have a major impact on your health and your baby's health. Find out about the possible complications, recommendations for weight gain and what you can do to promote a healthy pregnancy.
What's considered obese?
Obesity is defined as having an excessive amount of body fat. A formula based on height and weight — called the body mass index (BMI) — is often used to determine if a person is obese.
|30 and higher
|40 and higher
Could obesity affect my ability to get pregnant?
Being obese can harm your fertility by inhibiting normal ovulation. Obesity can also affect the outcome of in vitro fertilization (IVF). As a woman's BMI increases, so does the risk of unsuccessful IVF.
How might obesity affect my pregnancy?
Being obese during pregnancy increases the risk of various pregnancy complications, including:
March 27, 2015
- Gestational diabetes. Women who are obese are more likely to have diabetes that develops during pregnancy (gestational diabetes) than are women who have a normal weight.
- Preeclampsia. Women who are obese are at increased risk of developing a pregnancy complication characterized by high blood pressure and signs of damage to another organ system, often the kidneys (preeclampsia).
- Infection. Women who are obese during pregnancy are at increased risk of urinary tract infections. Obesity also increases the risk of postpartum infection, whether the baby is delivered vaginally or by C-section.
- Overdue pregnancy. Obesity increases the risk that pregnancy will continue beyond the expected due date.
- Labor problems. Labor induction is more common in women who are obese. Obesity can also interfere with the use of certain types of pain medication, such as an epidural block.
- C-section. Obesity during pregnancy increases the likelihood of elective and emergency C-sections. Obesity also increases the risk of C-section complications, such as wound infections. Women who are obese are also less likely to have a successful vaginal delivery after a C-section (VBAC).
- Pregnancy loss. Obesity increases the risk of miscarriage.
See more In-depth
- 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.