Question

How does the embryo get nourishment inside the mother’s body?

Answer 1

Nutrients such as glucose and free fatty acids are distributed by the mother into the foetal bloodstream to meet the developmental needs of the embryo. In this case, the structure itself acts as the liver of the foetus(embryo) and synthesizes proteins. This is because most maternal proteins cannot cross the structure and reach the foetal circulation.

Complete answer:
We know that embryos get their nutrition from the placenta.
Let's study about it in detail.

Structure-The placenta is the structure that establishes a stable relationship between the foetus and the mother. On the outer surface of the chorion, a series of fingerlike projections, known as chorionic villi, grow in the tissue of the uterus. This hair penetrates the inner wall of the mother's uterus and forms the placenta.
The placenta is the link between the inner wall of the foetus and the inner wall of the uterus. Thus, the placenta is partly the mother and partly the embryo. Through the placenta, the developing embryo receives nutrients and oxygen from the mother and releases carbon dioxide and nitrogen in the lungs. Inside the placenta, the blood of the foetus is very close to that of the mother, which ensures the exchange of substances between the foetuses. Food (glucose, amino acids, lipids), water, minerals, vitamins, hormones, antibodies and oxygen are transferred from the mother's blood to the foetal blood, and the foetal metabolic products such as carbon dioxide, urea, and warning labels enter the mother's blood.
Thus, the placenta serves as an organ of nutrition, respiration and excretion of the foetus. The blood of the mother and foetus does not mix at all in the placenta or elsewhere. The foetal blood in the chorionic villi capillaries is in close contact with the mother's blood in the tissues between the villi. They are always separated by a membrane through which the material must diffuse or be transported through an active energy-intensive process.

Note:
Before implantation, embryonic cells are spent in the uterine cavity for about 72 hours. At that time, nutrients could not be obtained directly from the mother's blood and had to rely on nutrients released from the uterus, such as iron and fat-soluble vitamins.
The human placenta is described as sagging (close contact of the head with the mother's tissues), discoid (forks appear in the form of intervertebral discs), hematomas (the chorionic epithelium, which is in direct contact with maternal blood).