Second Trimester of Pregnancy Pregnancy Birth Baby Baby Development Fetal Movement

You made it to your second trimester! Getting through the first may have been draining, but take a little comfort in knowing that this trimester is often referred to as the easiest of the three by many expecting moms like yourself. While your body is now displaying your pregnancy, which gives you bragging rights with your expanding belly, your baby is getting his or her own bragging rights. Peek inside your tummy to get a look at your baby’s growth during the second trimester, figuratively speaking of course.

Month 4

The official beginning of your second trimester is at the end of week thirteen, and your baby is quickly growing and changing. The average size of your baby right now is three to four inches long, and weighing about one to two ounces. The skin is still transparent and veins can clearly be seen.

The delicate bone formations in your baby’s tiny body are finally beginning to form and become a little harder in substance. This development is especially true for the bones of the skull and face now. But, please note, your baby’s cranial region will remain somewhat soft until months after delivery. The reason for the soft cranial area is so that passage through the birth canal can occur without damage to the baby’s brain.

Hair, and the way it will grow, is becoming more noticeable on your baby’s scalp. The bones and muscles that have been forming and evolving over the past few weeks are now more likely to be visible on ultrasound. During the time period of eighteen to twenty weeks, you should have an ultrasound performed to check on your baby’s growth and development thus far. The baby’s sex organs are developed and it is during this ultrasound that you will have the opportunity to learn the sex if you want to know and if your baby cooperates.

Month 5

The muscles in your baby’s body are growing as well, and while not plentiful in strength just yet, they are being used multiple times throughout the day and night. Your baby moves, plays, kicks, and explores inside your tummy more and more each day. While movement has been happening for weeks, you may not be feeling them just yet. This is especially true if this is your first baby, or if you are overweight. If you are a veteran mom, or very thin or slender in size, you may feel noticeable little flutters about now. The movements you may feel won’t be constantly felt as your baby will have many resting periods and times of gentle movements. Your baby may now be about three to five ounces in weight, and about three to five inches long.

Fat will begin forming in deposits under your baby’s skin by as early as the seventeenth week. Plumping up and filling out will be one of the most important things that will continue to occur until baby’s birth. The fat provides your baby the ability to maintain body heat after delivery, cushions his or her bone structures, and fills out all of the loose, thin skin your baby has had for weeks.

By week eighteen, your little bundle of baby should be able to hear. The audible sounds your baby hears are very muffled due to being heard through the amniotic fluid surrounding him or her. The sounds most likely heard by baby will be your voice, gas sounds in your body, your tummy gurgling, deep male voices like daddy’s, and loud external sounds like fire engines and yelling.

Month 6

The kidneys have started processing your baby’s urine, and he or she can excrete the urine into your amniotic sac. Around week twenty-one, your baby will be swallowing the amniotic fluid and processing it through the kidneys and bladder several times daily. It’s a little weird imagining your baby swimming in urine, but it’s a safe, natural element of development in your second trimester. As your baby swallows the amniotic fluid all around him or her, the fluid makes it way to the kidneys and is processed just like yours, but it recycles itself for continual use by your baby time and time again and poses no harm.

By the twentieth week, you should be feeling movement! This is such a marvelous time for you because you are getting closer to meeting this new little miracle in person. Baby’s weight should be about nine to eleven ounces, and length should be about five to seven inches crown to rump.

Lanugo forms all over your baby around week twenty to twenty-two. This fuzzy abundance of hair is necessary for holding on to the layer of vernix that will cover and protect your baby’s skin. Vernix is a substance that is kind of waxy or cheesy in texture and will completely cover your baby until it is washed off after delivery.

By the end of your second trimester, your baby will be about a pound in weight, possibly two for some babies, and about eight to eleven inches long! The fingernails, toe nails, hand and foot prints will be formed, and your baby’s lungs are creating surfactant. The surfactant is a coating that will let the small air sacs in the lungs be able to receive oxygen and inflate after delivery. If your baby were to be born now, he or she would have an awesome shot at survival with medical help.

You are quickly approaching your third, and final, trimester of pregnancy. Though the first trimester was one filled with wonder and new rapid development, the second is filled with bigger developments like feeling your baby move, and knowing that your baby could survive outside of the womb with help. Your baby is making his or her way closer and closer by the day to being in your arms.