​Is the Baby Genetically Related to the Surrogate? Do They Share Blood?

Traditional vs Gestational Surrogacy, Source: GoIVFSurrogacy

One of the most common questions intended parents and surrogates ask during the surrogacy journey is about biology: “Is the baby genetically related to the surrogate?” or “Does the baby share blood with the surrogate?” These questions are natural, and understanding the science behind them can bring comfort, clarity, and confidence as you move forward.

Genetics and Surrogacy: Understanding the Connection

The answer to these questions depends on the type of surrogacy chosen.

Gestational Surrogacy (most common today): In this process, an embryo is created through IVF using the intended parent(s)’ egg and sperm, or donor egg/sperm. The embryo is then transferred via catheter to the surrogate’s uterus. This means the baby is not genetically related to the surrogate. The baby’s genetic link is only to the egg and sperm providers.

Traditional Surrogacy (rare today): In this process, the surrogate’s egg is used, making her the genetic parent of the child. This form is much less common due to legal, ethical, and emotional complexities.

If you would like to explore more about gestational and traditional surrogacy options, potential costs, and legal considerations, visit Babymoon’s  website for additional educational resources.

Do the Surrogate and Baby Share Blood?

This is a frequent point of confusion. While the baby grows inside the surrogate’s womb, their blood does not mix.

The baby is supported through the placenta and umbilical cord, which act as a life-giving bridge. Nutrients and oxygen pass from the surrogate’s bloodstream through the placenta to the baby, but their blood remains separate. The placenta functions like a filter, keeping the baby’s circulation distinct and safe.

So, while the surrogate provides a nurturing environment, there is no direct sharing of blood between her and the baby.

Why This Matters for Intended Parents

For many intended parents, knowing that their baby remains genetically theirs and that the surrogate’s role is solely to provide a safe environment can bring reassurance. It also helps explain why intended parents can feel deeply connected from the very beginning, even though another person is carrying the pregnancy.

At the same time, understanding the surrogate’s vital role often brings even greater appreciation for the gift she is giving: carrying your child with love and care, even without a genetic tie.

Building Connection Without Genetics

A baby doesn’t need shared blood to form bonds. Love, presence, and intention are what build family. Intended parents can begin creating connections during pregnancy by:

• Attending ultrasounds or medical appointments (in person or virtually).

• Recording lullabies or bedtime stories for the surrogate to play.

• Keeping a journal or memory book of the journey to share with the child later.

  
  

These small but meaningful acts can help parents feel close to their baby before birth.

A Journey of Science and Heart

Surrogacy is made possible by both advanced science and extraordinary generosity. While genetics and biology provide one part of the answer, the heart of surrogacy lies in the connection between intended parents, their surrogate, and the child they are bringing into the world.

At Babymoon, we are here to guide you through every question so you feel supported and informed throughout your journey.