A small amount of fetal tricuspid regurgitation at 25 weeks is usually normal, but it is abnormal if the small amount of tricuspid regurgitation becomes moderate to severe as the fetus develops. Fetal tricuspid regurgitation is a term used to describe the fetal heart and to assess the closure of the fetal tricuspid valve. 25 weeks fetal tricuspid regurgitation may be incompletely developed, and may continue to develop at a later stage, causing the regurgitation to disappear, which is generally normal if all other obstetric tests are normal. If a small amount of tricuspid regurgitation becomes moderate to severe and is combined with other fetal abnormalities, it may be due to chromosomal abnormalities or other reasons, which is not normal. If a small amount of fetal tricuspid regurgitation at 25 weeks, the changes in regurgitation should be closely monitored under the direction of the doctor, and once the lesser regurgitation is found to be aggravated, timely therapeutic measures should be taken.