Obesity and Pregnancy Risks

A higher BMI affects the body's metabolism and cardiovascular system during the unique stress test of pregnancy. It can make the body more resistant to insulin (increasing diabetes risk) and put more strain on the heart and blood vessels (increasing blood pressure risk). Additionally, increased maternal tissue can sometimes make it technically more difficult for ultrasound waves to provide the high-resolution images needed for anomaly screening.

Higher BMI (Class I, II, or III) is associated with an increased risk of:

• Neural Tube Defects: Like spina bifida (this is why high-dose folic acid is essential).
• Gestational Diabetes (GDM): Higher resistance to insulin.
• Hypertension and Pre-eclampsia: Increased vascular stress.
• Large Babies (Macrosomia): Which can lead to more difficult births or C-sections.
• Blood Clots (VTE): Increased risk of clots in the legs or lungs.

We use a 'High BMI' care bundle starting from the first trimester:

1. BMI Calculation: Measured at your first visit to categorize risk appropriately.
2. Early GDM Screening: Testing for diabetes at booking and again at 24 weeks.
3. Anomaly Scan Support: Scheduling extra time for your 20-week scan or utilizing specialized ultrasound technology to ensure the best possible visualization of the baby's heart and spine.

Our management plan is proactive and non-judgmental:

• High-Dose Folic Acid: We prescribe 5mg (instead of the standard 0.4mg) to be taken before and during the first trimester to protect the baby’s spine.
• Weight Management: We do not recommend 'dieting' or weight loss once pregnant, but we help you aim for a healthy, limited weight gain range (usually 5-9kg for BMI >30).
• Thromboprophylaxis: For women with a very high BMI, we may recommend blood-thinning injections (heparin) after birth or during late pregnancy to prevent clots.
• Anesthesia Consultation: A meeting with our obstetric anesthesiologist to plan for pain management during labor, which can sometimes be more complex.

Through proactive management, most risks can be successfully mitigated:

• Detection: Early screening ensures that if diabetes or high blood pressure develops, it is treated immediately, protecting the baby's growth and health.
• Birth Planning: We discuss birth options early, focusing on the safest environment—this may include a recommendation for a hospital birth with a full multidisciplinary team available.

If your BMI is over 35 or 40, you should ideally have a pre-conception consultation or be referred to a high-risk obstetrician early in your first trimester.

Our team, including Dr. Leanne Bricker and Dr. Maria Haji Liga, provides specialized care for women with a higher BMI. We combine medical expertise with a supportive approach, focusing on your health and your baby’s safety without the stigma often associated with weight in healthcare.