A Complete Guide for You and Your Baby
You have been diagnosed with gestational diabetes. This guide will help you understand what it means, what to do, and how to protect your baby.
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You are not alone — this is one of the most common pregnancy complications
Pregnancies in the U.S. are affected by GDM
Of women with GDM develop Type 2 Diabetes within 10 years
Higher risk of GDM recurring in a future pregnancy
GDM is manageable. With the right care, most women with GDM have healthy pregnancies and healthy babies.
During pregnancy, the placenta makes hormones that block insulin from working properly.
Your pancreas cannot keep up, so blood sugar rises above the safe range.
GDM is caused by placental hormones — not by anything you ate or did wrong.
It typically resolves after delivery when the placenta is delivered.
GDM is usually diagnosed between 24–28 weeks, when placental hormone levels peak.
ACOG recommends universal screening at 24–28 weeks
Drink a 50g glucose solution. Blood drawn 1 hour later.
If ≥ 130–140 mg/dL → proceed to Step 2
No fasting required for this test.
Fasting + 100g glucose. Blood drawn at 1, 2, and 3 hours.
GDM diagnosed if 2 or more values exceed thresholds
Fasting required for this test.
Some providers use a one-step approach: a 2-hour 75g test (fasting required). Your provider will tell you which test you had.
Risk factors help identify who needs earlier or more frequent screening
Having risk factors does not mean you will develop GDM. Many women with no risk factors are also diagnosed. Screening is recommended for all pregnant women.
Not all GDM is the same — your type guides your treatment plan
Blood sugar stays within target range using healthy eating and physical activity alone.
Treatment: Medical Nutrition Therapy · Daily Exercise · Glucose Monitoring
Blood sugar requires insulin or metformin to stay consistently within the safe range.
Treatment: All Lifestyle Changes + Medication + Additional Fetal Monitoring
Most women start with A1GDM. About 1 in 3 will eventually need medication (A2GDM). This classification also guides decisions about delivery timing.
High blood sugar crosses the placenta and affects your baby's growth
When your blood sugar is high, extra glucose crosses the placenta to your baby.
Your baby's pancreas responds by making extra insulin, which acts like a growth hormone.
This can cause your baby to grow larger than normal (estimated fetal weight > 4,000 g).
Controlling your blood sugar dramatically reduces all of these risks. Every healthy meal and every glucose check matters.
| Risk | What It Means | Prevention |
|---|---|---|
| Macrosomia | Baby grows too large (>4,000 g) | Blood sugar control |
| Shoulder Dystocia | Shoulder gets stuck during delivery | Blood sugar control + monitoring |
| Neonatal Hypoglycemia | Low blood sugar right after birth | Tight glucose control in labor |
| Breathing Difficulties | Immature lung development | Avoid early delivery when possible |
| Future Obesity / T2DM | Long-term metabolic programming | Breastfeeding + healthy family habits |
The good news: controlling your blood sugar dramatically reduces all of these risks.
GDM affects your health too — both now and in the future
Risk of Type 2 Diabetes within 10 years
2×Higher lifetime cardiovascular risk
A GDM diagnosis is your body's early warning system. Acting now — with lifestyle changes — can protect your long-term health.
Keeping your levels in this range helps protect your baby
Your doctor will tell you whether to test 1 hour OR 2 hours after meals. You usually do not need to do both.
Targets per ACOG Practice Bulletin No. 190 · ADA Standards of Care
Two ways to monitor your levels: Fingersticks and CGMs
If your CGM reading does not match how you feel, or shows a very low/high number, always double-check with a fingerstick before treating.
Food is your first medicine
Eat every 2–3 hours. Aim for 3 meals and 2–3 snacks daily to prevent sugar spikes and drops.
Never eat a "naked" carb. Always pair carbohydrates with protein or healthy fats to slow digestion.
Choose complex carbohydrates (whole grains, veggies) over simple sugars (juice, sweets).
You do not need to eliminate carbohydrates. The goal is to choose the right type and amount to keep blood sugar stable.
Focus on quality carbohydrates that digest slowly to keep blood sugar stable
Physical activity is one of the most powerful tools to lower blood sugar
A short walk after each meal helps your muscles use up glucose naturally, lowering your numbers without medication.
Aim for 150 minutes of moderate activity per week — that's just 30 minutes a day, 5 days a week.
Always check with your provider before starting a new exercise routine.
If diet and exercise are not enough, medication is safe and effective
The preferred medication for GDM. Does not cross the placenta. Highly effective at controlling blood sugar.
Given as injections. Your diabetes educator will teach you how.
An oral pill that reduces insulin resistance. Safe for use in pregnancy and well-studied.
Does cross the placenta in small amounts; long-term data are reassuring.
Needing medication does not mean you failed. It means your body needs extra help — and that help is available and safe.
Close surveillance helps us catch and treat problems early
Detailed survey of baby's organs, heart, and structure.
Detailed look at baby's heart — GDM increases risk of cardiac defects.
Serial scans every 4 weeks to track baby's size and amniotic fluid.
Weekly or twice-weekly fetal heart rate monitoring for A2GDM patients.
A1GDM patients may need less monitoring. Your team will tailor the plan to your specific situation.
A biophysical profile uses ultrasound to assess baby's movements, breathing, muscle tone, and amniotic fluid — a comprehensive check.
These tests are reassurance tools. They help your team confirm your baby is doing well.
ACOG recommendations for delivery timing with GDM
| GDM Type | Blood Sugar Control | Recommended Delivery |
|---|---|---|
| A1GDM | Well-controlled on diet alone | 39 weeks 0 days – 40 weeks 6 days |
| A2GDM | Well-controlled on medication | 39 weeks 0 days |
| A2GDM | Poorly controlled | 37–39 weeks (individualized) |
| Any GDM | Macrosomia ≥ 4,500 g | Cesarean delivery discussed |
Your delivery plan is individualized. Your care team will discuss the safest timing for you and your baby.
ACOG Practice Bulletin No. 190 · SMFM Consult Series #58
Your blood sugar will be checked every 1–2 hours during labor. The goal is to keep levels between 70–110 mg/dL.
If blood sugar rises during labor, IV insulin may be given to protect your baby from neonatal hypoglycemia.
This is one of the most important follow-up steps after delivery
Schedule your test between 4 and 12 weeks after your delivery.
The 75g 2-Hour Oral Glucose Tolerance Test — fasting + 2-hour blood draw.
The A1C test is not recommended this soon after delivery. Blood loss and rapid cell turnover make it inaccurate.
| Result | Next Step |
|---|---|
| Normal | Re-screen every 1–3 years |
| Prediabetes | Lifestyle changes + consider Metformin |
| Diabetes | Referral to Endocrinology |
Your action plan for a healthy future
Women with GDM have a 7-fold increased risk of developing Type 2 Diabetes later in life.
Losing just 5–7% of your body weight can significantly lower your risk of diabetes.
Understanding how your pregnancy affects your child's future metabolism
High blood sugar in the womb can "program" your baby's metabolism to store fat more easily.
Babies born to moms with uncontrolled GDM have a higher risk of childhood obesity and Type 2 Diabetes.
By keeping your blood sugar in range now, you are actively lowering these risks for your child.
After birth: breastfeeding, a healthy family diet, and keeping your child active are powerful ways to continue this protection.
"You are not just managing a condition — you are changing your family's health history."
You are not alone — a team of experts is here to support you and your baby
We communicate regularly to ensure you and your baby receive the best coordinated care. You are the most important member of the team.
Be an active partner in your care — bring this list to your next visit
How often and by what method should I send you my blood sugar logs?
What are my specific goals for fasting and post-meal numbers? Should I test 1 or 2 hours after eating?
At what blood sugar level should I call the office immediately?
Will I need extra growth ultrasounds or nonstress tests? When do those start?
How does my diagnosis affect my delivery timing? Will I need to be induced?
When should I schedule my 2-hour glucose test after the baby is born?
Key takeaways for a healthy pregnancy
GDM is caused by placental hormones blocking your insulin — not by something you did wrong.
Complex carbs paired with protein and healthy fats is the most powerful way to control blood sugar.
A 10–15 minute walk after meals helps your muscles use up glucose naturally.
If diet isn't enough, insulin or metformin are safe tools to protect your baby.
05 — Follow Up Postpartum: Don't forget your 2-hour glucose test 4–12 weeks after delivery to ensure your diabetes has resolved.
Gestational diabetes is a challenge, but it is temporary. Every healthy meal, every walk, and every fingerstick is an act of love for your baby.
Questions? Write them down and bring them to your next appointment.
Based on ACOG Practice Bulletin No. 190 (Gestational Diabetes Mellitus) · SMFM Consult Series #58 · ADA Standards of Care · Atlanta Perinatal Associates