A Guide to Your Personalized Care Plan
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Pre-pregnancy BMI determines your care plan
| Class | BMI (kg/m²) | Label | Stillbirth Risk vs. Normal |
|---|---|---|---|
| Class I | 30.0 – 34.9 | Obesity | 1.71× |
| Class II | 35.0 – 39.9 | Obesity | 2.00× |
| Class III | 40.0 – 49.9 | Morbid Obesity | 2.48× |
| Super Morbid | ≥ 50.0 | Extreme Obesity | 3.16× |
Source: ACOG Practice Bulletin No. 230 (2021)
Body Mass Index (BMI) is calculated from your height and weight before pregnancy.
Your healthcare team uses this number to plan your pregnancy care — not to judge you.
Higher BMI is associated with some pregnancy complications.
Important: This doesn't mean complications will happen — it means your care team will monitor you more closely.
Most women with obesity have healthy pregnancies and healthy babies.
This is why we monitor more closely at higher BMI classes
| BMI Class | Risk vs. Normal Weight |
|---|---|
| Class I (30–34.9) | 1.71× |
| Class II (35–39.9) | 2.00× |
| Class III (≥40) | 2.48× |
| Super Morbid (≥50) | 3.16× |
ACOG Practice Bulletin No. 230
Risk is 5.7× higher at 39 weeks
Risk is 13.6× higher at 41 weeks
Early monitoring finds problems before they happen — that's the goal.
Your team watches for these conditions
These are possibilities, not certainties. Your care is customized to prevent problems.
Class III obesity carries a relative risk of 3.55 for gestational diabetes (GDM)
(95% CI 3.26–3.86)
Early screening catches diabetes before it affects your baby.
Your personalized care plan includes
At every prenatal visit — watching for preeclampsia
First trimester + 24–28 weeks (earlier if risk factors present)
Anatomy at 18–22 weeks; serial growth scans from 32 weeks onward
Timing depends on your BMI class — see next slides
Fundal height (tape measure) is unreliable in obesity
Adipose tissue prevents accurate measurement of baby's size
Ultrasound is the only reliable method to assess fetal growth in this population
Serial scans identify both macrosomia and growth restriction
Your team will use ultrasound — not just a tape measure — to track your baby's growth throughout the third trimester.
ACOG recommends ultrasound for all patients with BMI ≥30
Detailed anatomy survey — may need a longer exam or a repeat visit
Begin serial growth + amniotic fluid volume (AFV) ultrasounds
Ongoing growth and fluid monitoring through delivery planning
Serial scans identify both too-large (macrosomia) and too-small (growth restriction) babies.
Adipose tissue attenuates sound waves — here's what we do about it
| BMI Class | Standard US Detection | Targeted US Detection |
|---|---|---|
| Normal (<25) | 66% | 97% |
| Class I (30–34.9) | 48% | 75% |
| Class II (35–39.9) | 45% | 88% |
| Class III (≥40) | 22% | 75% |
We use targeted/detailed ultrasound to maximize detection. Longer exams and repeat visits may be needed — this is expected and normal.
Data: Dashe JS et al. Obstet Gynecol 2009;113:1001–7 | ACOG PB 230
| Test | When | Why |
|---|---|---|
| Early glucose test | First trimester | Screen for pre-existing diabetes |
| Detailed ultrasound | 18–22 weeks | Anatomy survey |
| Growth ultrasounds | ≥32 weeks (every 4 wks) | Track size + amniotic fluid |
| Nonstress test (NST) | Based on BMI class | Check baby's heart rate patterns |
| Biophysical profile (BPP) | If NST is nonreactive | Comprehensive fetal assessment |
Not everyone needs all tests — your team decides based on your specific situation.
Testing schedule is based on your BMI class — ACOG Practice Bulletin 230
| BMI Class | BMI Range | US Growth/Fluid | NST/BPP Testing |
|---|---|---|---|
| Class I | 30.0–34.9 | Start ≥32 weeks | Only if comorbidities present |
| Class II | 35.0–39.9 | Start ≥32 weeks | Only if comorbidities present |
| Class III | 40.0–49.9 | Start ≥32 weeks | Consider at 34–37 weeks |
| Super Morbid | ≥50.0 | Start ≥32 weeks | Suggested at 37 0/7 weeks |
Comorbidities (hypertension, diabetes, prior stillbirth) may trigger earlier testing in any class.
Women with higher BMI often need longer NSTs (≥30 min) as BMI increases.
This is expected and normal — not a sign of a problem.
A BPP adds ultrasound assessment of baby's movements, breathing, tone, and fluid — a comprehensive check.
Ways to help yourself and your baby
For BMI ≥30: Aim for 11–20 pounds total during pregnancy
This is a guideline, not a strict rule. Focus on healthy habits, not the scale.
No. Pregnancy is not the time for weight-loss diets.
Your baby needs nutrients to grow. Instead, focus on:
Very low gestational weight gain may reduce macrosomia risk but can increase the risk of a small-for-gestational-age (SGA) baby. Your team will guide you.
After delivery, your healthcare team can help you reach a healthy weight safely.
ACOG recommendations for timing
Delivery between 39 weeks 0 days and 40 weeks 6 days
Timing depends on the specific condition and how you and baby are doing
Your team will discuss the safest individualized plan with you
Most women with obesity deliver at term. Early delivery is only done when medically necessary.
Your team prepares for what might happen, not what will happen.
Special attention to:
Your postpartum care is just as important as your prenatal care.
If you're thinking about another baby someday:
Every pregnancy is different. Past pregnancies don't predict future ones.
Not automatically. Many women with obesity deliver vaginally. Your delivery method depends on how labor goes and your baby's position.
Usually yes. Sometimes we need a longer exam or a repeat visit — but we can almost always get the images we need.
Most babies born to mothers with obesity are completely healthy. That's why we monitor closely — to catch and treat any problems early.
You're not alone — these specialists may help with your care
You're the most important member of the team. Speak up with questions or concerns.
Don't wait — call right away if you have:
These symptoms need immediate attention. You're not bothering anyone by calling.
Obesity is one factor in your pregnancy — not the only factor. Your health, your actions, and your partnership with your care team matter more.
Pregnancy is a journey. Your care team is walking beside you every step of the way.
Questions? Write them down and bring them to your next appointment.
Based on ACOG Practice Bulletin No. 230 (2021) · SMFM Guidelines · Atlanta Perinatal Associates