So far, research on this type of treatment is limited and not all physicians are convinced of the rooms' benefits.
Still, Meredith said the experience can help families bond with their new child, so that they feel more comfortable when they bring the baby home.
"It says to the family, 'We welcome you to be part of your child's care, and you are the parent. Be here, be part of what's going on,'" Meredith said. "The older environments, which were much more crowded and loud … were not terribly family friendly. And families didn't feel as comfortable about spending time there."
So far, only a fraction of the nation's neonatal facilities have these rooms, but many more are under construction.
At Phoenix Children's, more than a hundred "womb rooms" are nearly complete, giving the tiniest patients room to grow with the help of medicine and mom.