I don't have any recent experience, but my now 29 yr old daughter had feet that turned inward quite severely. She wore corrective shoes and some other special shoes with a metal brace between them while she slept. The brace kept the feet in just the right position. Talk about adaptibilty! She just took it all in stride and learned to sleep with that thing on. The really bad part was that when she woke up in her crib, for her own amusement, before I'd go get her was.... she'd raise her legs up and down together and rake the heck out of the slats of the crib, a crib I borrowed. LOL.
As she got walking more and more, her weight plus the corrective shoes straightened everything out just perfectly. She never had another lick of trouble. I don't recall how long exactly she wore these but it wasn't that long....maybe a year or even less. I just can't remember for sure.
Don't worry. Talk to your pediatrician and he'll recommend an orthopedic guy. You can call now and talk it over. He may not be able to give you definitive answers without seeing the baby but he may be able to give you a ball park idea of what might be done. It might just surprise you. Maybe it won't turn out to be too big a deal, depending on just how the bones are formed or what is causing it. If surgery is ever needed, you know how far they've come these days with repairing things. It's just amazing. Don't worry too much.