When exploring surrogacy, many intended parents naturally ask whether a surrogate is biologically related to the baby she carries. It’s a thoughtful and common question, and the answer depends on the type of surrogacy being used.
At Hatch, we work exclusively with gestational surrogates, which means our surrogates do not share DNA with the babies they carry. Still, understanding why that’s the case, and what role a surrogate does play, can help clarify what to expect during the surrogacy journey.
DNA is what makes us who we are. It determines things like hair color, eye shape, and countless other traits. A child’s DNA comes entirely from two sources: the egg and the sperm used to create the embryo.
If someone contributes an egg or sperm, they share DNA with the child. But if they carry the baby without contributing either, as is the case with gestational surrogates, there’s no genetic connection.
In gestational surrogacy, a surrogate mother is not biologically related to the baby. The embryo is created using an egg and sperm from the intended parents or donors, and the surrogate’s role is to carry the pregnancy, not to pass on her genetic material.
This is an important distinction, as people often associate pregnancy with parenthood in a biological sense. But in gestational surrogacy, the connection is physical, not genetic.
In traditional surrogacy, the surrogate uses her own egg, meaning she is both the biological and birth mother of the baby. While this approach was used more frequently in the past, it’s now extremely rare and not supported by most surrogacy professionals due to legal and emotional complexities.
Gestational surrogacy, which is the model used by Hatch, involves no genetic link between the surrogate and the baby. The embryo is created through IVF using someone else’s egg and sperm and is then transferred to the surrogate’s uterus.
No, the baby will not resemble the surrogate in a genetic sense. Because the surrogate does not contribute an egg, traits like eye color, facial structure, or height are inherited from the biological parents or donors.
While the surrogate’s health and pregnancy experience can influence how the baby grows in the womb, physical features are determined solely by the baby’s DNA, not the surrogate’s.
The surrogate and baby do not share blood during pregnancy.
Instead, they are connected through the placenta, which acts as a filter. It allows nutrients and oxygen to pass from the surrogate to the baby while keeping their blood supplies separate. This barrier protects both the baby and the surrogate and ensures they remain physiologically distinct.
Yes, but not genetically. This is where epigenetics comes in. Epigenetics refers to how environmental factors in the womb can affect how a baby’s genes are expressed (without changing the genes themselves).
Things like the surrogate’s nutrition, stress levels, and overall health may have a subtle impact on fetal development, such as influencing birth weight or immune strength. However, these influences do not alter the baby’s DNA, nor do they create a biological connection between the surrogate and the child.
If you’re working with a gestational surrogate, she won’t share DNA with your baby, and she won’t be biologically related to them. Her role is to provide a healthy, nurturing environment for the baby’s growth and development, but the child’s genetic identity comes entirely from the egg and sperm used during IVF.
Understanding the difference between gestational and traditional surrogacy can offer clarity and reassurance for intended parents. At Hatch, we’re here to support you every step of the way with guidance, transparency, and care.
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