What happens to the Fetus in Second Trimester?

The second trimester of pregnancy is the period from the 13th to the 28th week. This is usually the period mothers enjoy the most. During this time the early signs of pregnancy like fatigue and morning sickness usually decrease and may even vanish altogether. The baby in the womb undergoes many changes. The fetus is fully formed and all the organs start developing. The end of fifth month is the most exciting phase because the mother experiences the movements of the fetus. As baby grows, the mother’s silhouette changes dramatically and stretch marks may start appearing.

Significant changes during the Second trimester:

Fourth Month:

  • The fetus’ head is large, compared to the body, but the organs begin developing.
  • The muscles of the fetus start to form and develop so the movements of the fetus, at first tentative, soon become frequent and stronger.
  • The kidneys begin producing urine which goes into the amniotic fluid.
  • Thus, the amniotic fluid is changed very frequently.
  • The fetus has breathing movements and a transparent, thin hair called lanugo covers the whole body of the fetus.
  • Eyebrows and eyelashes start forming.
  • Teeth start forming and as does the bridge to his nose.
  • Finger and toe nails are formed.
  • The baby can suck its thumb and has vocal cords and taste buds forming.
  • Heart beats at a rate of 120-160 beats per minute.
  • The length of the baby averages 15-17cm.

Fifth Month:

  • This is the time when the fetus grows active.
  • The fetus reacts to sounds made outside the womb.
  • The middle ear organs of the ear are formed.
  • A sticky substance called the vernix casseosa is formed all over the body to protect the skin of the fetus when in the amniotic fluid.
  • The blood cells begin functioning and producing blood.
  • The fetus weighs an average of 340 gm and its length is 10-12 inches approximately.

Sixth Month:

  • The fetus is fully formed and looks like a human baby.
  • The skin is wrinkled and red.
  • The brain continues to develop rapidly.
  • The eyes are open and are blue.
  • The baby’s first stool (meconium) is slowly produced.
  • To keep the baby warm during birth, a special kind of fat is formed.
  • Eggs in the ovaries are developed in baby girls.
  • Sheaths of fat are formed which transmit electrical impulses along the nerve endings.
  • The movements are very frequent and you can feel the shape of a limb or bottom when the baby moves.
  • At the end of sixth month the fetus would probably weigh about 900 grams and its length may be around 11-14 inches.

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