Second Trimester of Pregnancy Symptoms Pregnancy Stages: Week by Week Fetal Development

You are now getting into the second trimester of your pregnancy and fetal development. Week 14 to 27 make up the second trimester as you track your pregnancy week by week. As your body goes through pregnancy stages, it is important to ensure your baby is growing in a healthy manner.

 Baby growth during pregnancy is also rapid during the second trimester. It is in these weeks that you will be called in for an ultrasound to ensure fetal development is healthy and normal.

 Pregnancy Symptoms of Fetal Development in Second Trimester

 Although you are over the initial symptoms, your body is continuing to change for baby growth during pregnancy week by week. It is important to know some of these signs so that you can get adequate pregnancy care.

 At 14 weeks:

Brain impulses are now transmitted, so the baby can change facial expressions, like wrinkling the eyebrows. The baby can now suck its thumb, squint and pass urine. The eyes and ears are moving to their final positions. The baby starts to develop fine, downy covering of hair all over the body. The baby can hiccup too. You can hear your baby’s heartbeats through an instrument called the Foetal Doppler.

 At 15 weeks:

The baby’s eyelids are still fused but the little one can sense light. Taste buds are starting to form. Amniotic fluid passes through her nose and upper respiratory tract, which helps the primitive air sacs in her lungs to develop. The legs are longer than the arms now and baby is now “mobile”.

 16 weeks:

The baby grows rapidly now and begins to look more human with the ears and eyes nearing their normal position and head becoming more erect. The heart starts pumping blood. Many women start to feel baby movements. The baby may start making eye movements. The kidneys have started producing urine. The facial muscles are developing and this makes it possible to open and close the mouth.

 17 weeks:

The skeleton is beginning to change from cartilage to bone and sweat glands begin to develop. The baby can hear the mothers’ heartbeat, stomach rumbling and blood passing through the veins. The baby can hear outside sounds like music, your voice etc

 18 weeks:

Myelin, a protective film is forming around the nerves and blood vessels of the baby are visible through the transparent skin. The baby’s senses are maturing. Female babies develop uteri and fallopian tubes. Male babies develop genitalia.

 19 weeks:

Special areas for touch, smell, sight, hearing and taste are now being designated in the baby’s brain. Hair starts developing on the scalp. A waxy coating starts forming on the skin.

 20 weeks:

The baby’sdigestive system is developing. So the baby swallows and digests, producing meconium which is a by- product of digestion. The filling out process starts as fat begins to accumulate beneath the skin. The organs like kidneys and genitalia start getting into their proper places. The brain continues to grow. Teeth begin to appear

 21 weeks:

The baby is beginning to develop eyebrows and eyelids. If the baby is a girl then the vagina is beginning to form. The fat deposition under the skin continues, as this will help keep baby warm after birth. The baby may occasionally hiccup. The lungs may start practicing the art of breathing.

 22 weeks:

The baby’s lips, eyebrows and eyelids are more distinct and tiny tooth buds form beneath the gums. The eyes have formed but the colour of the iris is yet to develop. The body has fine hair and wrinkles. The pancreas is developing rapidly. Senses start developing. The baby wiggles its fingers and may suck its thumb and swallow.

23 weeks:

Blood vessels develop in the lungs to prepare for breathing. The baby begins to recognise noise. Baby is more active in the night than day. The vestibular system which is the area of the brain responsible to sense movement is one of the first parts of the brain to mature. Hearing continues to develop and sharpen.

 24 weeks:

At this stage, the brain and taste buds are developing rapidly. Its breathing tube is branching into sub branches in the lungs and alveoli just start to form. Rapid eye movements are beginning too.

 25 weeks:

Fat begins to form, so the wrinkled skin begins to smoothen out. Hair colour and texture is now formed

 26 weeks:

The baby has now begun inhaling and exhaling small amounts of amniotic fluid. The baby continues to accumulate fat beneath its skin. The hearing is developing well and the baby can hear all sounds outside. The baby may open its eyes for the first time.

 27 weeks:

The baby can open and close its eyes, suck its fingers and sleeps at periodic intervals. The brain is well developed but the lungs are immature.

Tags: Fetal Development , Second Trimester of Pregnancy , Pregnancy Symptoms , Week by Week , Pregnancy Stages


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