Is being born with the heart on the right side of the body harmful in any medically or unusual way?

It can be: There is a rare condition known as situs inversus where all of the internal organs are reversed as in a mirror image, but everything works normally. An isolated right sided heart when tbhe other organs are normally positioned is frequently associated with congenital heart defects.

It depends...: By itself, having the heart on the right side (dextrocardia) is not harmful. However, about 30-40% of individuals with dextrocardia also have other heart problems, some of which can be dangerous if not treated properly. In addition, a fraction of people with dextrocardia also have have a condition called kartagener's syndrome, which can cause lung disease, sinusitis and infertility in men.