What are the factors affecting the mammalian embryo when it is in the uterus?

In mammals, the development of the embryo occurs in the uterus, that is, in utero. In this situation, external factors have little effect on its development. The main factor influencing the development of the embryo is the state of the maternal organism. This concept can include: obtaining a sufficient amount of nutrients, vitamins, hormonal balance of the body, the intake of a sufficient amount of fluid, the absence of stress, the absence of heavy loads on the body and physical influence from the outside, for example, damage.