Trisomy 13 occurs in approximately 1 in 5000 live births.īabies with monosomy X are females who have one X chromosome instead of two. About 10 percent survive to their first birthday. If born alive, most affected babies with trisomy 13 will pass away within the first few weeks of life. Given the severe disabilities, most pregnancies affected by trisomy 13 will miscarry. Visible abnormalities include extra fingers and or toes or an opening in the palate. They often have birth defect involving the heart, brain, and kidneys. Trisomy 18 occurs in approximately 1 in 3000 live births.īabies with trisomy 13 have three copies of chromosome 13 and have severe intellectual disabilities.
If born alive, most affected babies with trisomy 18 will pass away within the first few weeks of life. Unfortunately, most pregnancies with trisomy 18 will miscarry. Babies with trisomy 18 can also have visible birth defects such as an opening in the roof of the mouth (cleft palate), small head, clubbed feet, underdeveloped fingers and toes, and a small jaw. Miscarriage occurs in about 30% of pregnancies with Down syndrome while overall about 1 in 700 babies are born with Down syndrome.īabies with trisomy 18 have three copies of chromosome 18 and have severe intellectual disabilities and birth defects typically involving the heart, brain, and kidneys. The presence of medical conditions, like heart defects, can affect the lifespan in these children and adults however, most individuals with Down syndrome will live into their 60s. Early intervention has allowed many individuals with Down syndrome to lead healthy and productive lives. Children with Down syndrome will need extra care depending on the child’s specific health problems. Babies with Down syndrome have three copies of chromosome 21 and have intellectual disabilities that range from mild to severe.
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