When do fingerprints develop in babies

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Next Article What is a 3D projection called? Back To Top. Twenty-one weeks into your pregnancy, or 19 weeks after conception, your baby is completely covered with a fine, downy hair called lanugo.

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.

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Products and services. Free E-newsletter Subscribe to Housecall Our general interest e-newsletter keeps you up to date on a wide variety of health topics. Sign up now. It used to be that scientists believed fetuses had about as much of a sense of smell as they had a s What is the difference between gestational age and fetal age? Stephen Clark, DO. When we start talking about the length of pregnancy and the age of the baby, it can sometimes be What should I do if I can't feel my baby move during the third trimester?

Count the Kicks.