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Yes and No. During the normal course of a pregnacy, No. The mothers and babies blood does not mix or circulate together. The umbilical cord attaches to the placenta. The placenta is the "container" that keeps the baby "isolated" from the mother. The fetal blood flows through the baby, out the umbilical cord to the placenta and no further.

The placental membrane separates maternal blood from fetal blood.

Oxygen and nutrients in the maternal blood in the intervillous spaces diffuse through the walls of the villi and enter the fetal capillaries. (this unfortunately means that bad things like alcohol and drugs diffuse through the membrane, also.)

Carbon dioxide and waste products diffuse from blood in the fetal capillaries through the walls of the villi to the maternal blood in the intervillous spaces.

Just like the walls of your own digestive system, the food you eat does not come into direct contact with your blood, but the nutients get into your blood and are transferred to all parts of your body. Now for the Yes part of the answer. Certain circumstances can cause them to mix, like miscarriage, abortion, and birth. This is when diseases can be transmitted, or problems with blood RH incompatibility can occur, but that's a whole other WikiSubject.

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Wiki User

16y ago
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Wiki User

13y ago

Because there is always the chance the mother and child have incompatible blood types that would cause her to develop antibodies to the baby's blood - causing her body to treat the baby as a foreign invader- the antibody from the mother may enter the bloodstream of the baby causing destruction of his or her red blood cells - meaning the child would become severely anemic.

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Wiki User

12y ago

Yes, it is possible. If this happens and you have what is known as an "ABO/Rh incompatibility", the mother is treated with anticoagulant medication such as Heparin to stop the agglutination of the erythrocytes

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Wiki User

15y ago

No, they come very close but they never mix

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Wiki User

14y ago

Because the mother's blood is pumped around her body under a lot of pressure, which would damage the delicate foetus.

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Wiki User

14y ago

no......... but in RH incompatibility its mix after birth of baby.....

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Wiki User

13y ago

the baby will still be conceived but after an abortion of some sort the baby will be mostly likely dead

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Nancy Keosedile

Lvl 2
11mo ago

to prevent the blood to dot

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14y ago

Not under normal conditions

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Wiki User

11y ago

fetal development

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Q: Does blood of the mother and fetus mix?
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Related questions

Which process normally occurs at the placenta?

nutrition for fetus no blood mix thru mother and fueetus


Where does the human embryo get blood from mother or father?

The mother shares her blood with the fetus. The fetus makes its own blood. The mother's blood comes in close proximity to the fetal blood to exchange oxygen and nutrients, but the two bloods do not mix. If they mixed, mother and baby would always have the same blood type - which is not true.


Toxins can enter the fetus by?

blood flow from the mother to the fetus


What is the function of the placental?

it is the interface between the fetus and the mother's blood supply it acts like a filter - supplying nutrients to the fetus and disposing of waste material from the fetus to the mother all of this without actually mixing the blood of the fetus and the mother


Can a fetus survive when mother is a and fetus is b blood group?

Yes, there is no danger to the fetus is the mother is type A and baby is type B


What does a fetus takes from the mother blood?

The blood is "grown" by the fetus along with the organs and bones. The fetal blood supply is separate from the mother's. The two blood systems interact through the placenta - oxygen and food pass though to the fetal blood from the mother, waste products flow from the fetus to the mother.


What is the source of nutrients in fetal blood?

Blood from the mother is used by the fetus.


How does the fetus get its oxygen?

From the mother's blood via the placenta.


Toxins can harm a developing fetus?

Absolutely YES! Substances of good/bad can be transported from what is inhale by the mother to the fetus by the process of "blood flow from the mother to the fetus" or entering the umbilical cord to the fetus .


How does a developing baby get food and oxygen during the pregnancy?

Baby gets food and oxygen through the umbilical cord. This umbilical cord is attached to the placenta. This placenta is attached to the uterus. In the placenta blood of the mother comes close to the blood of the fetus. There is transfer of food and oxygen to the blood of fetus from the blood of mother. Carbon bi oxide and waste products of metabolism are transferred to the blood of mother from the blood of fetus.


Do mother and baby share blood?

No. The placenta produces and cleanses the blood for the fetus.


How does a unborn baby get food?

The fetus is connected to its mother by an umbilical cord. The mother's blood carries nutrients through the umbilical cord to the fetus and carries away wastes from the fetus.