What is Trisomy 18 Syndrome?

Trisomy 18 syndrome (also known as Edwards syndrome) is a condition that is caused from a chromosomal defect. This syndrome usually occurs in about 1 of every 3,000 live births. This number is increases significantly when the early pregnancy loss has been factored and they occur to the 3rd and 2nd trimesters of pregnancy. If you are new to all these, you might ask yourself what really causes trisomy 18 syndrome.

The cause of the trisomy 18 syndrome can be explained at conception. At conception, the 23 chromosomes coming from the mother and 23 chromosomes coming from the father all combine so that a baby can be created using a set of about 46 chromosomes in each of the cell. The trisomy is going to occur when your baby has up to three chromosome #18 instead of having the normal two. All these usually happen when conception is taking place. Many parents usually worry so much about this, but it better that parents know it is not their doing.

what is trisomy 18 syndrome edwards syndrome

If your baby happens to suffer from trisomy 18 syndrome, then it is your duty as a parent to notify your doctor and know the type of syndrome your baby is suffering from. Trisomy 18 manifests in three types including Mosaic trisomy 18, partial trisomy 18 and full trisomy 18. The full trisomy syndrome is one of the most commonly known types of trisomy.


With the full trisomy, you are going to have the extra #18 chromosomes occur in all the cells of your child’s body. Partial trisomy is another type of trisomy that is usually very rare. This chromosome is rare because it occurs when a part of the extra chromosome is available. The other type of trisomy is mosaic trisomy 18 syndrome. This type is said to be rare and appears when the other chromosomes are present in some of your body’s cells.

  • Anthony

    My sister’s daughter was born with Trisomy 18 and I had no idea what it was…it looks like a pretty rough disease. The kid in this picture looks like he is doing pretty well though. Do you have any idea what the survival rate typically is?