distinguish between prenatal & postnatal

During prenatal development, a particular organ or body part is most vulnerable to exposure to teratogens during its:

Prenatal development actually begins when the first initial cells divide. Development continues daily until the baby is born. There are differing opinions about this and it is somewhat subject to debate.

First Stage: The first two weeks after conception are known as the Germinal stage.

Second Stage: The next six weeks of development are known as the Embryonic stage.

Third Stage: The remainder of prenatal development is known as the Fetal stage.

Zygote-> Embryo -> Fetus