Title: Embryo vs. Fetus: The Stages of Pregnancy
Headings: Embryo vs. Fetus: Differences Between Stages Week by Week
Embryo vs. Fetus: Differences Between Stages Week by Week
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Embryo vs. fetus week by week
What is an embryo?
Early Pregnancy Symptoms and Signs
What is a fetus?
The developing embryo: Week #4 to Week #11
Fetal period: week #12 to week #40
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Content: The heart and main blood vessels are formed, and the heart starts beating by the 6th week. The primitive brain and spinal cord (neural tube) also begin to form. By 12 weeks of pregnancy almost all of the baby’s organs are formed, including the arms and legs. The brain and spinal cord, however, continue to develop throughout pregnancy. The baby is about 2 inches long at the end of the embryonic period. Most birth defects occur during the embryonic period, the critical time when organs are forming. The embryonic period is the time of greatest susceptibility to the negative effects of drugs, radiation, and viral infections. Fetal period: week #12 to week #40
The fetal period is a time of growth of the developing baby. The organs and structures formed in the embryonic period continue to grow and develop.