The specific condition of fetal hydronephrosis 18mm after birth varies from person to person.
Fetal hydronephrosis 18mm may be self-absorbed after birth and will not affect the function of the kidneys. However, for those with hydronephrosis, if combined with other abnormal ultrasound indicators, they may be born with chromosomal abnormalities and urinary tract malformations.
If ultrasound is performed during pregnancy and the fetus is found to have hydronephrosis, it is generally necessary to make a comprehensive judgment on the treatment plan based on the severity of hydronephrosis and whether there are other abnormalities in the ultrasound indicators. If the amount of hydronephrosis is less than 15mm and there are no other abnormalities, it will not affect the renal function and may be absorbed after birth.
If the hydronephrosis is more than 15mm or 20mm, the hydronephrosis is relatively serious, and accompanied by other ultrasound abnormalities, it suggests that there is chromosomal abnormality in the fetus, or urological malformation, which may have a great impact on the child after birth.
Therefore, if the fetus has hydronephrosis during pregnancy, it is recommended to combine the results of related examinations with the doctor’s guidance to formulate a comprehensive treatment plan.