I can say that, in newborns, there is often a little right sided enlargement of the atrium and ventricle, as the pressure across
the lungs is higher as a newborn, then drops over time. A
PDA and PFO are both normal findings
in a newborn. They spontaneously resolve, although a PFO can persist in up to 25% of adults. It may be too soon to tell if the PFO is a small ASD (actual defect), but either way, it sounds small and likely to not cause a problem.