Germinal Embroyonic Fetal

Okay ~Elizabeth, let's break this down.

Here are the developmental stages from conception, with key influences:

1. Germinal Stage (conception to ~2 weeks):

   • Key Influences: Genetic makeup of the zygote, the health of the egg and sperm, and the uterine environment for implantation.

2. Embryonic Stage (~3 to ~8 weeks):

   • Key Influences: This is a period of rapid organogenesis. The embryo is highly sensitive to teratogens (e.g., certain medications, alcohol, infections) which can cause major birth defects. Maternal health and nutrition are also critical.

3. Fetal Stage (~9 weeks to birth):

   • Key Influences: Focus shifts to growth and maturation of existing organs. Influences include maternal nutrition, oxygen supply, exposure to toxins, and maternal stress. The fetus gains weight and develops more complex functions.