Growth & Development of Your Baby During First Trimester | Dr. Monika Agrawal

From the moment you get the news that you are pregnant, you will probably be filled with a rush of emotions – and most likely a flood of questions too. While the first trimester of pregnancy is filled with a host of changes for you and for your baby, many will be invisible to the outside world. Read on to find out the growth and development of your baby during the first trimester.

Her Care Clinic – Your Baby during First Trimester

First Trimester: It is a span of 12 weeks. In this trimester the fertilized egg change from small grouping cells to a fetus that starts to have baby features. 

At the end of the first month

  • Amniotic Sac forms around the fertilized egg. 
  • A round, flat organ called the placenta, which transfers nutrients from the mother to baby and transfers waste from the baby, develops by the end of the first month 
  • Primitive face takes form with large dark circles for eyes.
  • Mouth, lower jaw, and throat start developing 
  • Blood cells start taking shape and circulation begins
  • By the end of the first month, your baby is around 6-7 mm (¼ inch) long – about the size of a grain of rice. 

Week 8 (2nd Month)

  • Facial features continue to developing 
  • Each ear starts developing like a little fold of skin at the side of the head 
  • Tiny buds start forming which eventually grows into arms and legs
  • Fingers, toes, and eyes also start forming 
  • The neural tube (brain, spinal cord, and other neural tissue of the central nervous system) is well-formed. 
  • The digestive tract and sensory organs start developing
  • Bone starts to replace cartilage 
  • The embryo starts moving although you may not feel it. 
  • By the end of this month, your baby is a fetus about 2.54 cm (1 inch) long and weighs about 9.45g

Week 12 (3rd Month)

  • Your baby is fully formed by the end of the third month 
  • Your baby has arms, hands, fingers, feet, and toes and can open and close its fists and mouth
  • Fingernails and toenails start developing, and the external ears are formed
  • Although the reproductive organs develop, the baby‘s gender is difficult to distinguish on ultrasound
  • Circulatory and urinary systems start working and the liver produces bile
  • At the end of the third month, your baby is about 7.6-10 cm (3-4 inches) long weighs about 28g

Since the most critical development has taken place, your chance of miscarriage drops considerably after three months.

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