PRENATAL DEVELOPMENT

PRENATAL DEVELOPMENT

1. zygote stage week 1-2

   • First week of pregnancy, begins with the first menstrual period.
   • The second week an egg is released from the ovary, this is when you are most likely to conceive.

2. embryo stage week 3-8

   • Week 3: After intercourse, sperm travel through the cervix. When the spermatozoon enters the ovule, conseption occurs. The zygote contains all the genetic information.
   • Week 4: Once the blastocyst reaches the uterus, it embeds itself in the uterine wall to support the baby.
   • Week 5: It is the beginning of the embryonic period. It develops the main systems and structures of the baby. The cells of the embryo multiply and begin to assume specific functions. In the first trimester the baby is at greater risk of damage.
   • Week 6 and 7: The growth of the fingertips, arms and legs begins. The brain begins to grow and is divided into 5 areas. Tissues begin to form. The baby's heart continues to develop and begins to beat.
   • Week 8: Lengthening of the arms, legs, hands of the baby. The brain and lungs continue to form.

3. fetus stage week 9-38

   • Week 9 : Nipples and follicles are formed. Arms grow and elbows develop. The feet and essential organs are observed.
   • week 10 Most distinctive facial features. The ears begin to take shape.
   • week 11 to 14: The eyelids close. The baby's face is well formed and the limbs long. Fingernails and toenails appear. Genitalia appear.
   • week 15 18: The baby's skin is almost transparent. The baby's head bones and muscle tissues develop.
   • week 19 to 21: The baby begins to hear. The baby moves and begins to be more active.

4. Fetus stage week 9-38

   • week 22 Anugo collects the whole baby. Eyebrows and eyelashes appear. Nails grow the end of the fingers.
   • week 23 to 25: The bone marrow produces blood cells. Lower airways of the lungs develop.
   • week 26: Footprints and fingerprints develop. All part of the eyes are formed.
   • week 27 to 30: The brain grows rapidly. The eyelids open and close. The nervous system develops.
   • week 31 to 34: The lungs are not fully formed. Bones are soft.
   • week 35 to 37: The heart and blood vessels are complete. Developed muscles and bones.
   • week 38 to 40: The anugo disappears except in the upper part of the arms and shoulders. Hair is thicker and dense. The baby can be born at any time.

Images and files in the map