Allie and Chris Taylor vividly remember the day their second son Jett was born.

“Jett was a gift to me — the one I fought and cried for,” Allie recalls.

Twenty weeks earlier, during a routine ultrasound conducted at a nearby hospital, Allie and Chris were told their unborn son’s kidneys were enlarged. Doctors feared the worst.

“They did a second ultrasound and told us my baby wouldn’t make it past 28 weeks gestation. We were told we should see a specialist but not to keep our hopes high.”

Allie and Chris were seen three days later at the Advanced Fetal Care Center at Boston Children’s Hospital. They met with a team of fetal and pediatric experts, including Dr. Richard Lee, co-director of the hospital’s Urologic Trauma Unit.

Lee shared his expertise and gave the Taylors hope. …