They attempted to fix a condition, which can cause heart failure and stroke after birth.
Surgeons in the US have performed brain surgery on a baby in the womb.
The team at Boston Children's Hospital used ultrasound to guide a needle through the mother's stomach to the baby's skull.
They attempted to fix a condition, which can cause heart failure and stroke after birth.
The baby was delivered two days later, without a decline in its condition.
In an update at 6 weeks, Dr. Darren Orbach said the baby is "progressing remarkably well", eating normally and gaining weight.
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