When you carry twins, triplets, or more, pregnancy becomes more of a challenge. It’s also less likely that all your babies will be born healthy.

A surgery called multifetal reduction lowers the number of fetuses and improves your chances for a healthy pregnancy. Also called fetal reduction or selective pregnancy reduction, it’s a safe procedure, and chances of problems are small. Still, it can be a tough decision.

Why It’s Done ?

The more babies in your womb, the more likely you are to have a miscarriage or a stillbirth, when the baby dies during the second half of your pregnancy or during birth. Another worry is that the babies can be born too early.

Premature delivery can cause problems with your babies organs. They could also face lifelong health issues like cerebral palsy, intellectual disability, and vision and hearing loss.

How It’s Done ?

Usually, the procedure happens during the first trimester (12 weeks) of your pregnancy. That’s when the fetuses are still in separate fluid-filled pouches. Your doctor can look at the fetuses with an ultrasound probe. Using these pictures as a guide, your doctor will put a small needle in your belly or vagina, then gently inject a special drug into a pouch. This medicine quickly stops the fetus’s heart. Often, the doctor will reduce two fetuses.

Potential Problems and Aftercare

Infections from fetal reduction are rare. A small number of women can miscarry after the procedure.

Source
https://www.webmd.com/infertility-and-reproduction/fertility-multifetal-reduction#2