Month 4 of Pregnancy

Video Transcript

WebMD Pregnancy App.

Your baby grows and changes fast during your 2nd trimester. Here's an inside peek at her astonishing progress! By calendar week xiii, she's equally large as a lemon -- about 3 inches long. And she'due south learning how to eat by taking an occasional gulp of the amniotic fluid around her. Next week, she's a little bigger -- the length of a bell pepper. But past calendar week 15, your infant could be the size of a large russet white potato -- around six inches long. Her bones get harder and stronger during week 16. Now she can flex her arms and legs. Plus, her eyes can slowly movement around behind closed lids. Next calendar week she's the size of an asparagus spear -- almost 8 inches long. And she'southward on the move, doing flips and rolls. She can also make a fist and hold information technology to her mouth. Her confront gets more than defined during week xviii. Those footling eyelids, ears, and upper lip all come into sharper focus. Plus, she tin can hear sounds now. Your little one maybe over nine inches long -- about the size of an eggplant -- past week 19. Her lungs' main airways start to form. Something super adorable happens in week twenty -- your baby puts her feet and toes in her oral cavity. She also gets lots of sleep. Racket and movement tin can wake her up -- then proceed it downwards, would ya? (Only kidding.) Adjacent week your 10 and 1/2-inch tot is making strong kicks and turns. She'due south also forming brown fatty for warmth. Your infant's genitals are completely formed around week 22. It's possible to run into her eyebrows now, besides. And soft, warm hair called lanugo covers her. Past week 23, her fingers and toes look like tiny versions of yours -- and they've got fingerprints. Plus, your petty one now has a hush-hush talent: she can hiccup. At calendar week 24 your baby is pineapple-sized -- nearly 12 1/two inches long-- and 1 1/2 pounds. She could survive outside your womb if she was born now. Your little one knows the sound of your voice at week 25. She can recognize other familiar sounds likewise ... when she'south not sleeping. She snoozes 80% of the time now. By next week, she knows how to suck -- and she'll probably try that skill out on her pollex. At the terminate of your second trimester on week 27, your little one is the length of an English cucumber -- over 14 inches long. And all that moving effectually is paying off, giving her more than and more muscle tone.

In the second trimester of pregnancy -- months four, 5, and half-dozen -- your baby's fingers and toes are well-defined. Their eyelids, eyebrows, eyelashes, nails, and hair are formed, and teeth and bones are becoming denser. Your baby can even suck their thumb, yawn, stretch, and make faces.

The nervous system is starting to function at this point in pregnancy. The reproductive organs and genitalia are now fully developed, and your wellness care provider can see on ultrasound if you are having a boy or a girl. Your baby'southward heartbeat may now be audible through an instrument called a Doppler.

By the finish of the fourth calendar month, your baby is about 6 inches long and weighs about 4 ounces.

16 Weeks

Month 5 of Pregnancy

Hair is beginning to grow on your baby's head, and lanugo, a soft fine hair, covers their shoulders, dorsum, and temples. This hair protects your baby and is usually shed at the end of the infant's get-go calendar week of life.

Your infant's peel is covered with a whitish coating called vernix caseosa. This "cheesy" substance, thought to protect baby'south skin from long exposure to the amniotic fluid, is shed just before birth.

You may brainstorm to feel your baby motion, since they are developing muscles and exercising them. This showtime move is chosen quickening.

By the end of the fifth month of pregnancy, your baby is about ten inches long and weighs from one/2 to 1 pound.

Now that you've read nigh your infant's development in the first 20 weeks of pregnancy, accept this quiz to exam your smarts!

20 Weeks

Calendar month 6 of Pregnancy

By the end of the sixth month, your infant is about 12 inches long and weighs about 2 pounds. their skin is reddish in color, wrinkled, and veins are visible through the infant's translucent skin. Baby'south finger and toe prints are visible. The eyelids begin to part and the optics open.

Your baby may respond to sounds by moving or increasing the pulse, and you may notice jerking motions if baby hiccups.

If born prematurely, your baby may survive after the 23rd week of pregnancy with intensive care.

24 Weeks