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There are three stages of prenatal developmentā€”germinal, embryonic, and fetal. Prenatal development is also organized into trimesters: the first trimester ends with the end of the embryonic stage, the second trimester ends at week 20, and the third trimester ends at birth.

What are the most crucial weeks in pregnancy?

Pregnancy the three trimesters

  • First Trimester (0 to 13 Weeks) The first trimester is the most crucial to your baby’s development.
  • Second Trimester (14 to 26 Weeks)
  • Third Trimester (27 to 40 Weeks)

Why is the second trimester important?

The second trimester marks a turning point for the mother and fetus. You will usually begin to feel better and start showing the pregnancy more. Your fetus has now developed all its organs and systems and will now begin growing in length and weight.

What are 4 environmental factors that can harm a fetus?

Environmental factors which have been implicated in adverse pregnancy outcome include smoking, video display terminals, anesthetic gases, antineoplastic drugs and exposure to lead, selenium and inorganic mercury.

What are two factors that affect fetal development?

Genetic, nutritional, environmental, uteroplacental, and fetal factors have been suggested to influence fetal growth. Uteroplacental and umbilical blood flow and transplacental glucose and fetal insulin are major determinants of fetal growth.

How a mother’s emotional health can affect her fetus?

Benefits of emotional health during pregnancy When you feel happy and calm, it allows your baby to develop in a happy, calm environment. However, emotions like stress and anxiety can increase particular hormones in your body, which can affect your baby’s developing body and brain.

What is the most common genetic birth defect?

Chromosomal Abnormalities Many zygotes that carry such abnormalities do not develop into embryos, but among those that are carried to term, trisomy 21 (Down syndrome), trisomy 13 (Patau syndrome), and trisomy 18 (Edwards syndrome) are the most frequent birth defects.

What is the most rare birth defect?

What are rare birth defects?

  • 22q11. 2 deletion syndrome (DiGeorge Syndrome and Velocardiofacial syndrome)
  • Albinism, ocular.
  • Albinism, oculocutaneous.
  • Anencephaly (a neural tube defect)
  • Arnold-Chiari malformation (chiari malformation)
  • CHARGE syndrome.
  • Congenital adrenal hyperplasia.
  • Congenital diaphragmatic hernia (CDH)

Who is the rarest person?

Above: Eleven year old Damien Omler has a rare disease known as CDG. But he is the only known person in the world with a specific mutation, March 4, 2020.