Prenatal Development

Prenatal Development

1. zygote period

   • weeks 2and 3
     • In the second week of the menstrual cycle there is greater fertility at conception.
   • week 4
     • The uterus is thick and bloody so it supports the embryo.
   • week 3
     • The sperm meets the ovum in the cervix and the zygote is formed, this has genetic codes, the blastocyst is formed with internal cells that will form the embryo and external cells that form structures that protect the embryo.

2. embryonic period

   • week 5
     • Develops blood cells and neurons.
       • The embryo grows rapidly .
         • The brain, spinal cord, and digestive tract develop.
   • week 6 and 7
     • Arms and buds appear.
       • Your brain has 3 different parts.
         • Formation of eyes and ears.
           • Development of the spine and bones.
             • Your heart beats in a regular rhythm.
   • week 8
     • Your brain continues to develop.
       • Your lungs develop.
   • week 9
     • Nipple development
       • Hair follicles appear
         • Elbows appear.
           • Your organs begin to grow.
   • week 10
     • His eyelids close
       • His ears take their shape
         • His face is more specific

3. fetus period

   • week 11 to 14
     • -The baby's eyelids close and will not open again until about week 28 -the baby's face is well formed -the expressions are long and thin -the fingernails and toenails appear -the baby's liver is producing red blood cells -the head is very large about half the size of the baby -dental buds appear for the baby's teeth
   • week 15 to 18
     • -the baby's skin is almost transparent - a hair called the cloud develops on the baby's head -bones and muscle tissue become harder - genitalia appear -the baby begins to move and stretch - the liver and pancreas produce secretions -the baby begins to make sucking movements
   • week 19 to 21
     • the baby can hear and is more active - the mother begins to feel agitation in the lower abdomen this is called first fetal movements
   • week 22
     • - the woolly covers the whole body of the baby -the first position of the baby is formed in the intestinal tract - eyebrows and eyelashes appear - the baby is more active with increased muscle development - the baby's heartbeat is listened to with a stethoscope -Nails grow to the ends of the baby's fingers
   • week 23 to 25
     • -the bone marrow begins to produce blood cells - the lower airways of the baby's lungs develop - the baby begins to store fat - Air sacs are formed in the baby's lungs but the lungs are not yet ready to work outside the uterus.
   • week 27 to 30
     • the baby's brain grows fast. - the nervous system is developed enough to control some functions of the body - the baby's eyelids can be opened and closed - the respiratory system, although immature, produces surfactant, this helps the alveoli to fill with air
   • week 31 to 34
     • -the baby grows quickly and accumulates a lot of fat - Rhythmic breathing occurs even though the baby's lungs are not fully mature. - the baby's bones are fully developed but are still soft - the baby's body begins to store iron, calcium and phosphorus
   • week 35 to 37
     • -the baby weighs about 5 and a half pounds the baby continues to gain weight but probably will not gain more -the skin is not so wrinkled - the baby has defined sleep patterns - the baby's heart and blood vessels are complete
   • week 38 to 40
     • - the woolly one has disappeared except in the arms and shoulders - nails can extend beyond the tips of the fingers - small breast buds occur in both sexes -the hair on the head is thicker and more abundant

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