At our anatomy scan a few weeks ago, the baby was found to have an echogenic intracardiac focus, or a calcium deposit on the heart. It can sometimes be a marker for down syndrome so it increased our chances of Down's from 1:10,000 to 1:2,500. Sometimes the deposit goes away later in the pregnancy and there's nothing to worry about.
We had a follow up appointment today, and baby girl's heart (and the rest of her body) look totally normal! So glad!