Becoming a surrogate is an incredible and selfless journey—one that involves not just heart and compassion, but also careful health evaluations to ensure the safety of both the surrogate and the baby. Among the many health considerations is one important number that often raises questions: BMI, or Body Mass Index.
At Surrogacy by Faith, we believe in helping potential surrogates understand every part of the process with transparency and care. If you’re wondering whether your BMI might impact your eligibility to become a surrogate, this guide will explain why BMI matters, what the typical requirements are, and how you can meet them if needed.
What Is BMI?
BMI, or Body Mass Index, is a measurement calculated using your height and weight. It’s used by healthcare professionals as a general indicator of whether someone is underweight, at a healthy weight, overweight, or obese.
Here’s how BMI is generally categorized:
- Underweight: Below 18.5
- Normal/Healthy weight: 18.5 – 24.9
- Overweight: 25 – 29.9
- Obese: 30 and above
You can calculate your BMI using a simple formula:
BMI = weight (kg) / height² (m²)
Or, you can use one of the many online calculators to quickly check your number.
While BMI isn’t a perfect reflection of health—muscle mass and body composition aren’t factored in—it still plays a significant role in fertility and pregnancy outcomes.
Why Does BMI Matter in Surrogacy?
BMI can influence everything from conception success rates to the health of the pregnancy. For surrogacy, intended parents, fertility specialists, and surrogacy agencies want to ensure the best possible environment for the embryo to implant, grow, and thrive. Here’s why BMI is an important factor:
1. Impact on IVF Success
Most surrogacies involve in vitro fertilization (IVF). Studies show that a BMI over 27 can reduce the likelihood of a successful IVF cycle by up to 33%. A healthy BMI improves the odds of successful embryo implantation and a healthy, full-term pregnancy.
2. Pregnancy Health and Risks
A BMI that is too high or too low can increase the risk of complications such as:
- Gestational diabetes
- Preeclampsia
- Preterm birth
- Cesarean delivery
- Miscarriage
Maintaining a healthy BMI helps minimize these risks—for you and for the baby you’re carrying on behalf of the intended parents.
3. Hormonal Balance
Hormones that regulate ovulation and menstrual cycles can be disrupted by extremes in body fat. A balanced BMI supports hormonal health, which is essential for the success of the surrogacy journey.
What Are BMI Requirements for Surrogates
BMI plays a key role in determining a woman’s eligibility to become a surrogate. Most surrogacy professionals, including fertility clinics and agencies, look for a BMI typically between 19 and 32. This range reflects a balance where pregnancy risks are minimized, and IVF procedures are more likely to be successful. A BMI below 19 may suggest undernourishment or hormonal imbalance, both of which can interfere with implantation and a healthy pregnancy. On the other hand, a BMI over 32 can increase the risk of complications such as gestational diabetes, hypertension, and C-section deliveries.
It’s important to note that while BMI is one of the first metrics evaluated, it isn’t always viewed in isolation. Surrogates with a slightly higher or lower BMI may still be considered if they are otherwise healthy and meet all other physical and lifestyle requirements. That’s why an initial BMI check is often followed by a more thorough medical review to assess the surrogate’s full health picture. If you’re interested in becoming a surrogate and are unsure whether your BMI is within the acceptable range, speaking with a surrogacy coordinator is the best way to understand your options and get personalized guidance.
Surrogacy By Faith BMI Requirements
At Surrogacy by Faith, we typically accept surrogate applicants with a BMI between 19 and 32.
This range is considered optimal for a healthy pregnancy and the IVF process. While there are occasional exceptions made based on overall health and the recommendations of fertility clinics, most clinics—and intended parents—look for candidates within this BMI window.
If you’re unsure whether your BMI falls within this range, don’t worry. We’re happy to walk you through what that number means and what steps you can take to meet the requirements.
Learn more about general surrogate health requirements
Does Surrogacy by Faith Make BMI Exceptions?
Yes—sometimes.
We understand that BMI doesn’t tell the whole story. At Surrogacy by Faith, we consider the full picture of your health, lifestyle, past pregnancy experiences, and any recommendations from your doctor or fertility specialist. If your BMI is slightly above or below the range, we may still proceed with a review on a case-by-case basis.
This personalized, compassionate approach is part of what makes Surrogacy by Faith different. We don’t treat surrogate applicants like numbers. We treat you like a whole person—with unique strengths, health history, and a desire to help others build a family.
Achieving a Healthy BMI for Surrogacy
If your BMI is currently outside of the recommended range, it doesn’t necessarily mean you’re disqualified—it may just mean you’ll need a little time and guidance to get there.
Here are some supportive, healthy ways to approach adjusting your BMI:
1. Speak with Your Doctor
Before beginning any weight loss or gain plan, consult with a healthcare provider to discuss your goals and ensure you’re making healthy changes that are sustainable.
2. Focus on Balanced Nutrition
Eating a variety of whole foods—vegetables, fruits, lean proteins, and whole grains—can help support a healthy weight and improve fertility.
3. Regular Movement
You don’t need to become a marathon runner, but gentle, consistent movement like walking, yoga, or light strength training can make a big difference.
4. Be Patient with Yourself
Your body has carried life before, and it can do it again. Give yourself grace and time. At Surrogacy by Faith, we’re here to encourage you every step of the way.
BMI in Context with Other Health Requirements
BMI is just one piece of a larger puzzle. While it’s important, it’s not the only factor considered in your surrogacy eligibility. Mental health, a history of successful pregnancies, and an otherwise healthy lifestyle are also considered key. That’s why we also assess other important health criteria, such as:
- Having had at least one full-term, uncomplicated pregnancy
- Being free from certain chronic medical conditions
- Not using tobacco or recreational drugs
Check out the full list of surrogate health requirements. And if you’re wondering whether anything in your history might disqualify you, we encourage you to review our dedicated resource on surrogate disqualifications to make sure there aren’t any other outstanding requirements that might stand in the way.
Common Questions About BMI and Surrogacy
Questions regularly asked concerning BMI and the surrogacy process:
Can I be a surrogate if my BMI is slightly above the requirement?
In some cases, yes. If you’re close to the 32 threshold and otherwise healthy, we may consider your application in partnership with a fertility clinic. Have an in-depth conversation and go over your health history with a professional or a better understanding.
How do I know if my BMI is healthy for fertility?
A BMI between 19 and 25 is generally considered ideal for fertility. If you’re in this range, you’re in a strong position to proceed. Learn more about what makes someone eligible to be a surrogate
What if I need help reaching the right BMI?
You’re not alone. Many women apply as surrogates while they’re still on their health journey. At Surrogacy by Faith, we offer encouragement and guidance—not judgment. If you truly need help losing weight, consider help from trainers at your local gym, signing up for a healthy meal delivery plan, or joining an exercise class. Your journey to the right BMI doesn’t have to be hard, it can be enjoyable as well.
Get Support With Surrogacy By Faith
Understanding BMI requirements is an important step in your surrogacy journey, but it shouldn’t feel like a barrier. It’s simply one of the many tools used to ensure the process is safe, ethical, and successful for everyone involved—especially you, the woman giving such a remarkable gift.
If you’re unsure where you stand or have questions about your BMI and how it might affect your eligibility, we’re always here to help. At Surrogacy by Faith, we believe in walking beside you with kindness, clarity, and trust. Ready to take the next step? If you’re interested in becoming a surrogate or pursuing parenthood through surrogacy, fill out our surrogate form or intended parent form today. We’ll be with you every step of the way to help build the family of your dreams.