1-all organs, tissues, and organ system begin to develop
2-the embryo is especially vulnerable to the effects of alcohol, tobacco, and drugs.
3-the first 2 weeks, the mother might not realize that she is pregnant
4-A lack of certain nutrients might cause damage to the developing embryo.
5-at the end of week 8, the embryo becomes a fetus
6-organ systems begun to form.
7-at the end of the first trimester, the fetus can move its arms, fingers, and toes