Heart murmur

Questions for moms with babies with heart murmurs

My 18 month old had a heart murmur when he was 2 months old. We went to the cardiologist and he had a pfo. The dr said it was an innocent murmur and to come back in a year.

We went back in November and he had an ekg and and an echo and dr said everything was perfect, murmur was gone (regular ped hadn’t heard the murmur since he was 3 months old).

So today at his 18 month check up the murmur was back after being undetected for 15 months! The pediatrician said it was normal for murmurs to come and go. I am worried tho because the cardiologist had said the problem that caused the murmur was gone, so then why is it coming back???

So I call the cardiologist and they are closed bc of the coronavirus!! Who knows when they will be opened again 🤷🏻‍♀️🤷🏻‍♀️🤷🏻‍♀️🤷🏻‍♀️I’m so nervous that he has another problem with his heart that went unnoticed

Anyone been in this situation before????