In first trimester of gestation is the period of embryonic and early fetal development and rudiments of all major organ systems appear
A new baby has just been conceived, and inside of its mother's uterus, it is beginning its first stages of development. Prenatal development, which covers the three main stages before to birth, is the time frame during which development occurs within the uterus. The germinal, embryonic, and fetal stages make up the three phases of prenatal development.
After fertilization, which occurs when a sperm and an egg (or ovum) come together, the embryonic stage, during which the child is known as an embryo, occurs after two weeks. An embryonic stage is what the word means when used literally. The embryo, or baby, in the case of prenatal development, is in the early stages of development, embodying the word.
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