Women's Healthcare Topics

Baby’s Development for Each Month of Pregnancy

Reviewed by James Brann, M.D.

How does my Baby Change in the First Month of Pregnancy?

  • After conception, your baby will attach to the lining of your uterus and the placenta will start to form.

  • The arms and legs will begin to protrude.

  • Already, the brain and spinal cord develop

  • The heart will start beating by the end of this month.

  • The baby will grow half an inch and weigh less than 1 ounce.

The Second Month Brings Unbelievable Change

Learn about your baby's growth for each month of pregnancy.
  • The eyes are closed and the eyelids form.

  • The inner part of the ear is starting to develop

  • Bones are becoming visible and the toes and fingers are developing.

  • The genitals will form structure.

  • At the end of this month, all of your baby's organs have started to develop.

  • The baby will grow to one inch and weigh one ounce by the end of this month.

The Rapid Growth of your Baby Continues Steadily during the Third Month

  • The teeth buds appear.

  • Although not yet functioning, all internal parts are formed.

  • The bones and muscles continue to rapidly develop.

  • The stomach and intestines begin to develop.

  • The skin has developed and is transparent.

  • The baby has rapidly grown to 3 1/2 inches and weighs more than 1 ounce now.

By the Fourth Month, you can Tell the Gender of Your Baby

  • The fingernails form.

  • Eyebrows and eyelashes appear.

  • Vernix, the waxy coating of the skin, is present.

  • . The skin loses its transparency and is wrinkled.

  • Fine hair called "lanugo", covers your baby.

  • The outer ear caught up with the inner ear now.

  • Your baby can swallow now.

  • Talk to your baby, it can hear now.

  • . The neck is extending.

  • Your baby now can produce urine.

  • The baby is huge now at almost 7 inches and weighs 5 ounces at the end of this month.

The Fifth Month, with Ultrasound, you can Watch your Baby Sucking his Hand

  • Your baby is moving everywhere now.

  • Sleep/wake cycles are now established.

  • The finger nails need to be trimmed.

  • Bile from the gallbladder begins to get ready to digest nutrients.

  • Girls now have all the eggs in their ovaries that they will ever produce.

  • Testicles are descending into their resting place in the scrotum.

  • Your baby measures 10 inches long and weighs one pound.

By the Sixth Month, you can Give your Baby a Haircut

  • The brain is continuing to mature.

  • Your baby's eyes are open.

  • You can fingerprint your baby.

  • Lungs are completely formed, but immature.

  • Your baby has reached one foot long and weighs about one and half pounds.

The Seventh Month brings with it, Stronger Kicks from your Baby

  • The baby reacts to light by opening and closing its eyes.

  • The “lanugo” hair starts to drop off the skin.

  • . Your baby can react to sound; you will want to begin singing and talking to your baby.

  • The grasping motion is functioning.

  • Your baby is 2 1/2 pounds and 14 inches long; big enough to survive if delivered.

The Eighth Month is Consumed with Fast Growth and Weight Gain

  • The bones are becoming hard.

  • The brain continues to progress.

  • The baby now can differentiate between sweet and sour as its taste buds mature.

  • You may notice flutters as your baby begins to hiccup.

  • Your baby is now 5 pounds and 18 inches long!

The Ninth Month is all about Getting Ready to be Delivered, the Head is Turned Downward for Birth

  • Lungs are mature and can function normally.

  • Skin is less wrinkled and covered with thick cheese-like substance called “vernix”.

  • Your baby's sleep patterns have been fully developed by now.

  • Your baby will weigh between 6 and 9 pounds at delivery and measures about 20 inches long.


Doctor's Corner

Pregnancy Week by Week - Women's Healthcare Topics