Need further information about lithium effects on fetal heart development mentioned in the articles of your earlier answer. Can heart problems show up later? I was on lithium during my pregnancy with our son after research and with doctor's knowledge. At age 16 a slight heart murmur was discovered during a physical with no treatment prescribed. Now our son , age 32, is experiencing chest pains, but tests show no heart attack--blaming stress as the cause. I am not so sure. Could a cardiologist be consulted and perhaps discover a connection for my "lithium baby"?