Can 'minimally invasive' heart surgery be performed on a child?

Yes: It depends on the condition.

Some: Some shunts and PDA closures are done with mics but all the major repairs require full sternotomy.

Yes, but depends: "minimally invasive" is a broad term. But many lesions can be done with "minimally invasive" techniques. And new techniques are being developed with catheters (which don't involve scalpels/surgery at all). The method of surgery often depends on the type of heart defect, so please discuss this with your child's cariologist.