Wonderful that they're doing so well. One of mine had a PDA with a slight murmur that our ped. detected on the follow up visit and had us into the cardiologist immediately (it was our first visit so within 48 hours of release). It closed on its own within 6 mo. with no meds. My girls came home around 34w5d, so I would think you're getting close. My DS had a similar type issue with coordination and was there another week or so.