The four/five-point restraint uses a lift-latch or a rotary buckle connector (Figure 5) for attachment of the pelvic harnesses. The four/five-point restraint does not have an enabling switch. Systems without an enabling switch are active (or enabled) when the system is completely electrically connected.
As genetic testing becomes increasingly available for these conditions, the Johns Hopkins Center for Inherited Heart Diseases can provide you with appropriate counseling on the risks and benefits of these tests.
There are many congenital heart diseases/defects, including benign conditions such as atrial septal defects, up to potentially fatal ones such as hypoplastic left heart syndrome. If by heart disease you mean atherosclerotic heart disease which causes heart attacks, then I am not aware of anyone ever being born with it. There are conditions in which one can develop very early coronary artery disease, but that is usually in the 20s, not at birth.