Higher risk for Down syndrome is primarily linked to advanced maternal age (over 35), having a previous child with Down syndrome, and parental carriers of a translocation, but it can happen to anyone; however, most babies with Down syndrome are born to younger mothers due to higher birth rates, and risk factors like ethnicity and folate intake are also studied.
Although women older than 35 years of age make up a small portion of all births6 in the United States each year, about one half of babies with Down syndrome are born to women in this age group. This likelihood increases as age increases.
Down syndrome occurs in people of all races and economic levels. The risk increases with the mother's age (1 in 1250 for a 25 year old mother to 1 in 1000 at age 31, 1 in 400 at age 35, and about 1 in 100 at age 40). However, 80% of babies with Down syndrome are born to women under age 35 years.
In the interim it has become clear, primarily by family linkage studies tracing DNA markers along the length of chromosome 21q between parents and children in DS families that the majority of T21 DS cases inherit the extra chromosome 21 from their mother (more than 90%) while in only a minority (less than 10%) the ...
Chromosomal Changes That Can Cause Down Syndrome
You can't prevent Down syndrome since it's a genetic condition. To learn more about your risk of having a child with a genetic condition, talk to your healthcare provider about genetic testing.
Down Syndrome Statistics by Country in 2025
Ireland – Ireland has the highest number of babies with Down syndrome, 27.5 out of 10,000 born there. Ireland has more children born with Down syndrome than other countries due to factors like older mothers, fewer prenatal screenings, cultural and ethical values.
This finding of the paternal age influence on Down syndrome suggests that there is a sperm contribution to the trisomy; increased paternal age may lead to an increased frequency of chromosome abnormalities in sperm, according to Dr. Fisch.
Down syndrome is caused by the presence of an extra chromosome number 21 in the cells of the developing baby. In an unscreened population, about one in every 700 babies is born with Down syndrome. Usually, it is not inherited, so a baby can be affected even if there is no history of Down syndrome in the family.
Down syndrome occurs in people of all races and economic levels, though older women have an increased chance of having a child with Down syndrome. A 35-year-old woman has about a one in 350 chance of conceiving a child with Down syndrome, and this chance increases gradually to 1 in 100 by age 40.
Of the people with Down syndrome in the United States: 67% are non-Hispanic and White, 13% non-Hispanic and Black, 16% Hispanic, 3% Asian or Pacific Islander, and 1% American Indian or American Native.
If you're over the age of 35, your pregnancy may be considered high risk due to “advanced maternal age.” This simply means you are more likely than younger women to have certain conditions and complications that may put you and your baby at risk.
Common physical signs of Down syndrome include a flat face, eyes that slant up, a short neck, small hands and feet, poor muscle tone, and loose joints. Common health problems in childhood include hearing loss, sleep apnea, ear infections, eye diseases, and heart defects.
Women over age 35 are at higher risk for giving birth to a child with Down syndrome. People have long recognized there is a connection between maternal age and Down syndrome.
Down syndrome is a genetic condition caused by having an extra full or partial copy of chromosome 21, leading to developmental differences; this usually happens randomly during cell division (Trisomy 21), but can also occur through translocation (a piece of chromosome 21 attaches to another chromosome) or mosaicism (only some cells have the extra copy). It's not caused by anything a parent did but by a spontaneous error in the egg or sperm, though older maternal age increases the risk.
Ultrasonography should not be used by itself to diagnose or exclude Down Syndrome. Sensitivity for detecting Down Syndrome is increased when ultrasound findings are interpreted in combination with serum analyte screening tests such as first and second trimester screening and integrated and sequential screening.
Either parent can pass the genetic translocation for Down syndrome on to their children. Having had one child with Down syndrome. Both parents who have one child with Down syndrome and parents who have a translocation themselves are at higher risk of having another child with Down syndrome.
Screening for Down's syndrome, Edwards' syndrome and Patau's syndrome. Screening your baby for Down's syndrome, Edwards' syndrome and Patau's syndrome is offered when you're between 10 and 20 weeks pregnant. It's done using a blood test and an ultrasound scan.
However, certain indicators can be observed during an ultrasound, which may suggest the possibility of Down syndrome. These Down syndrome signs are called 'soft markers' and could include aspects like nuchal translucency thickness or other physical traits.
As the father grows older, the number of mutations in the father's genome increases, leading to an increase in the incidence of congenital malformations in offspring [11, 65]. Older paternal age may be harmful to the offspring's health in terms of genetic mutations, telomere length, and epigenetics [66].
Risks for chromosome abnormalities by maternal age
The risk of chromosomal abnormality increases with maternal age. The chance of having a child affected by Down syndrome increases from about 1 in 1,250 for a woman who conceives at age 25, to about 1 in 100 for a woman who conceives at age 40.
Overall, the two sexes are affected roughly equally. The male-to-female ratio is slightly higher (approximately 1.15:1) in newborns with Down syndrome, but this effect is restricted to neonates with free trisomy 21.
The number of people is probably between 13,000 and 15,000. This means that in a group of 10,000 people in Australia, there are just over 5 people with Down syndrome. This is about the same as in other countries such as the UK. For every 1100 babies born in Australia, 1 will have Down syndrome.
Furthermore, though there are some indications in the Census data that incidence at birth may be falling, it is likely to remain comparatively higher than elsewhere because of a relatively large family size and high fertility rates in the 35 years and over age-groups and also because amniocentesis and abortion are not ...
ALSO, YES. Provided they're of legal age, there's no inherent reason an individual with Down syndrome can't consume alcohol. If people with Down syndrome don't drink alcohol, it's likely due to other factors rather than the condition itself. Yet, the myth persists.