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The lanugo helps hold the vernix caseosa on the skin. Twenty-two weeks into your pregnancy, or 20 weeks after conception, your baby's eyebrows and hair are visible. Brown fat also is forming, the site of heat production. Twenty-three weeks into your pregnancy, or 21 weeks after conception, your baby begins to have rapid eye movements. Ridges also form in the palms of the hands and soles of the feet that will later create the foundation for fingerprints and footprints.
Twenty-four weeks into your pregnancy, or 22 weeks after conception, your baby's skin is wrinkled, translucent and pink to red because of visible blood in the capillaries. By the end of the 25th week of pregnancy — 23 weeks after conception — your baby might be able to respond to your voice with movement. Twenty-five weeks into your pregnancy, or 23 weeks after conception, your baby might be able to respond to familiar sounds, such as your voice, with movement.
Your baby is spending most of his or her sleep time in rapid eye movement REM , when the eyes move rapidly even though the eyelids are closed. Twenty-six weeks into your pregnancy, or 24 weeks after conception, your baby's lungs are beginning to produce surfactant, the substance that allows the air sacs in the lungs to inflate — and keeps them from collapsing and sticking together when they deflate.
By now your baby might be 9 inches millimeters long from crown to rump and weigh nearly 2 pounds grams. This week marks the end of the second trimester. At 27 weeks, or 25 weeks after conception, your baby's nervous system is continuing to mature. Your baby is also gaining fat, which will help his or her skin look smoother. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below.
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Sign up now. Fetal development: The 2nd trimester Fetal development takes on new meaning in the second trimester. By the time you take your first breath, your lungs have already undergone a fascinating transformation. From birth through childhood and on to adulthood, your lungs experience an amazing journey, becoming the hard-working, life-sustaining organs that are so easy to take for granted. To better appreciate these essential organs , let's look at some breathtaking facts about our developing lungs:.
That's why it's important that parents do what they can to protect them from things that can hurt their lung development, like secondhand smoke and air pollution.
Here are some things you can do:. This November your donation goes even further to improve lung health and defeat lung cancer. Double Your Gift. Your tax-deductible donation funds lung disease and lung cancer research, new treatments, lung health education, and more. Join over , people who receive the latest news about lung health, including COVID, research, air quality, inspiring stories and resources.
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Our service is free and we are here to help you. Back to Each Breath Blog. To better appreciate these essential organs , let's look at some breathtaking facts about our developing lungs: Growth like a tree: While still in the womb , during one of the earliest periods of lung development called the pseudoglandular stage, the lungs grow like a tree, with branches sprouting out from the main left and right trunks.
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