First Trimester

This stage shows early signs of pregnancy. The first sign might be a realization of missed period; then a cease in ovulation. Here you will have to confirm all these signs by carrying out some pregnancy test.

The lady would also experience some physical or emotional changes such as

  • Extreme tiredness
  • Swollen and tender breast, nipples might become bigger
  • Morning sickness, a feeling of irritation and vomiting
  • A strong appetite or complete loss of appetite
  • Mood swing
  • Weight loss or gain

Stages of baby’s growth in 4 weeks

  • Formation of the central nervous system (brain and spinal cord)
  • Formation of the heart
  • Development of arm and leg bud
  • Complete formation of an embryo
  • The baby is now 1/25 of an inch long

Stages of baby’s growth in 8 weeks

  • All major organs must have started forming
  • The heart beat begins
  • The arm and legs grow longer
  • Formation of fingers and toes
  • Formation of the sex organs
  • The formation of facial features
  • The umbilical cord is clearly visible
  • Complete formation of the foetus
  • The baby is now nearly 1 inch long, and weighs about 3.5 gram.

Stages of baby’s growth in 12 weeks

  • This marks the end of the first trimester
  • The nerves and muscles begin to work; the baby can now make a fist.
  • Sex organ now visible.
  • The eyelid closes temporarily till week 28 to protect the developing eyes.
  • Head growth has slowed, and your baby is about 3 inches long, and weighs almost an ounce.


Second Trimester

At the start of the second Trimester, the mother has a noticeable change in her body. The baby bumps becomes more obvious and even by the end of this period, she probably would feel the movement of the baby in her womb.

Stages of baby’s growth in 16 weeks

  • The musculoskeletal system continues to form.
  • Skin begins to form and is nearly translucent.
  • Meconium develops in your baby’s intestinal tract. This will be your baby’s first bowel movement.
  • Your baby begins sucking motions with the mouth (sucking reflex).
  • Your baby is about 4 to 5 inches long and weighs almost 3 ounces.

Stages of baby’s growth in 16 weeks

  • Your baby is more active. You might feel movement or kicking.
  • Your baby is covered by fine, feathery hair called lanugo and a waxy protective coating called vernix.
  • Eyebrows, eyelashes, fingernails, and toenails have formed. Your baby can even scratch itself.
  • Your baby can hear and swallow.
  • Now halfway through your pregnancy, your baby is about 6 inches long and weighs about 9 ounces

Stages of baby’s growth in 16 weeks

  • The baby’s bone marrow begins to make blood cells.
  • Taste buds form on your baby’s tongue.
  • Footprints and fingerprints have formed.
  • Hair begins to grow on your baby’s head.
  • The lungs are formed, but do not yet work.
  • Your baby has a regular sleep cycle.
  • If your baby is a boy, his testicles begin to descend into the scrotum. If your baby is a girl, her uterus and ovaries are in place, and a lifetime supply of eggs has formed in the ovaries.
  • Your baby stores fat and weighs about 1½ pounds, and is 12 inches long.

THIRD TRIMESTER (Week 29 – 40)

Third Trimester

The mother would most probably experience difficulty in breathing and have to urinate more frequently. This is normal and once you give birth, these problems should go away. At this period, there is more pressure on the internal organ of the mother due to the growth of the baby.

Stages of baby’s growth in 32 weeks

  • Your baby’s bones are soft but fully formed.
  • Movements and kicking increase.
  • The eyes can open and close.
  • Lungs are not fully formed, but practice “breathing” movements occur.
  • Your baby’s body begins to store vital minerals, such as iron and calcium.
  • Lanugo (fine hair) begins to fall off.
  • Your baby is gaining about ½ pound a week, weighs about 4 to 4½ pounds, and is about 15 to 17 inches long.

Stages of baby’s growth in 36 weeks

  • The protective waxy coating (vernix) thickens.
  • Body fat increases.
  • Your baby is getting bigger and has less space to move around. Movements are less forceful, but you will still feel them.
  • Your baby is about 16 to 19 inches long and weighs about 6 to 6½ pounds.

Stages of baby’s growth in 40 weeks

  • By the end of 37 weeks, your baby is considered full term.
  • Your baby’s organs are capable of functioning on their own.
  • As you near your due date, your baby may turn into a head-down position for birth.
  • Average birth weight is between 6 pounds 2 ounces to 9 pounds 2 ounces and average length is 19 to 21 inches long. Most full-term babies fall within these ranges, but healthy babies come in many different weights and sizes.