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Week by Week Development in the Second Trimester of Pregnancy

Updated on October 20, 2017

Second Trimester Pregnancy Picture

The Second Trimester of Pregnancy

The second trimester of pregnancy or "honeymoon stage", is a very exciting time. It's when you begin to grow a small baby belly and no longer look as if you've had a few too many chocolate bars. And if you weren't feeling as if your pregnancy was real before. You will now as everything becomes a little more real once you begin to feel your babies first movements!

Week 13

Your babies body is finally beginning to catch up with the size of his/her head. He/she is becoming less and less of an odd looking creature and more baby like. Almost weighing a whole ounce he/she is really growing! Some more exciting news is your baby is not only beginning to look more like a baby but he/she is now acting more like a baby as he/she can now suck their thumb. Although, it is still to early for you to tell if your little one happens to be a girl. Is she is she already has as many eggs as she will in her entire lifetime. Unfortunately at this point you may be feeling some discomfort or sharp pains in your abdomen. But don't worry. This is completely normal and is more than likely round ligament pain as your uterus continues to grow.

Week 14

Your baby is growing fast! He/she is now somewhere between 1-2 ounces. And is now beginning to practice breathing while inside the womb by inhaling and exhaling amniotic fluid. More exciting news, your baby is now beginning to receive everything he/she needs from the placenta. That's you! Your baby is able to lots of new things this week as he/she practices using his/her hands and making facial expressions. You might even begin to start looking pregnant. However, some people may still be afraid to ask at this point.

Week 15

Whether your little one is born bald or with a full head of hair. His/her hair pattern is now beginning to develop. And your babies bones are starting to develop and harden as well! Your belly seems to be growing at lot every week and your uterus is now halfway between your pubic bone and belly button. If you begin to feel random, mild cramps or abdominal tightening don't worry these are likely to be braxton hicks. However, if they become regular, get stronger, or too painful seek medical attention. Your growing baby is now approximately 4 inches long and 2 1/2 ounces. You may be able to determine the sex of your baby this week. However, do not be upset if the tech is unable to at this point.

Week 16

Your baby is now approximately 4 1/2 inches long (about the size of an apple) and 3 1/2 ounces. No wonder your waist line has been expanding. As your babies bones harden and his/her movements become more coordinated you may begin to feel small movements! But don't worry if you haven't felt anything yet. Your baby is still quite small and has lots of room to move in your uterus. Your babies toe nails and finger nails have begun to grow and he/she may need them clipped soon after he/she is born. His/her little heart is hard at work as well. Pumping 25 quarts of blood a day! This will continue to increase as your little one grows.

Week 17

Your baby is packing on the fat! He/she is now approximately 5 inches long and 5 ounces. As the fat stores underneath his/her skin he/she will continue to put on the ounces. Even though your babies eyelids are still fused shut he/she can now blink in response to light outside of the womb. As your baby packs on the fat your belly continues to swell. This may effect your balance, so be careful and take it slow.

Week 18

Your baby is now 5 1/2 inches and 7 ounces approximately the size of a grapefruit. And your baby can hear! So start reading to him/her. He/she can hear your bodily sounds such as your heart beat and even the sound of your voice. Finger pads have also begun to develop. And your babies first bowel movement is beginning to form in his/her bowels. If you still haven't felt movement yet. Do not worry. He/she is moving but things such as mom being a little over weight, an anterior placenta, and thick uterus may make these movements difficult to be felt. If you are feeling jerking movements. Do not worry. Your little one just has the hiccups.

Week 19

Vernix, a greasy white substance has now covered your babies skin. This will protect his/her delicate skin. Your baby is now approximately 6 inches long and 8 1/2 ounces, over half a pound. His/her hair is just beginning to peek through his/her scalp. And lanugo, a fine hair is also covering your babies body by now.

Pregnancy Belly


Week 20

Congrats you are approximately half way there! Your baby is about 6 1/2 inches long from head to bum or 10 inches long from head to heel and 10 1/2 ounces by now. Your baby is already sleeping and waking like a newborn. You may notice his/her sleeping patterns by his/her movements. Most gender determining ultrasounds are performed around this time. And if your little one cooperates and uncrosses his/her legs you will know if you are carrying a boy or girl. Or you can keep this a surprise if you wish. Your baby is not the only one doing some growing. You may have gained as much as 10lbs by now!

Week 21

As your baby hits 7 inches from head to heel and 10 1/2 ounces his/her rapid growth begins to slow a little. As he/she will now concentrate more on gaining weight. Your babies eyebrows are now present as he/she is looking more and more like a little human being.

Week 22

Your baby is now 7 1/2 inches long and weighs around 1 pound.  If your little one is a boy his testes will start to descend into the scrotum.

Week 23

Your babies finger prints and foot prints are beginning to develop now. And your baby is now 11 inches from head to heel and weighs just over one pound. If he/she were to be born now they would have a chance at survival. Hopefully he/she stays in there, though! Your baby has grown so much that you not only are feeling movement but you might be able to see movement as well.

Week 24

Around this time your baby goes through a period of rapid weight gain. Gaining 4-6 ounces in only one week! He/she is almost a foot long by now. All of your babies facial features are now in place. And rapid eye movements (REM) have begun.

Week 25

He/she can smell you. Well not really but his/her nostrils open up this week. Your baby may respond to familiar sounds by this point. Such as you singing a song or the dog barking. Your baby is now approximately 13 1/2 inches from head to heel and is about 1.5 lbs. Whether your baby is a he or a she their reproductive organs are now formed. If you could see your baby now you may even be able to determine his/her hair colour.

Week 26

Your baby is now nearing 2 lbs and 14 inches from head to heel! His/her lungs are well on their way. Although, not completely ready to be breathing air quite yet. Your babies visual and hearing senses are becoming more fine tuned this week.

Week 27

This is last week of the second trimester. Your babies lungs and nervous system are still quite busy preparing your baby for the outside world. He/she is now about 14.5 inches from head to heel and even closer to the 2 lbs mark. Your babies eyelids may begin to open this week.

Congrats! You have now completed the second trimester. Your baby has done a lot of growing in these past few weeks. And you only have a few more weeks to go before you get to meet him/her. Enjoy the third and last trimester of your pregnancy.

Do you agree that the second trimester is the "honeymoon" stage?

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      Tika 2 years ago

      hey my name is shanice baier and i am 17 years old and i am 7 weeks and i am havnig my baby on july 29 2013 and i can't wait tell the baby cames and add me on gmail ok thahts

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      Darnesha 2 years ago

      Your post is a timely cooutibrtinn to the debate