When Giselle and Sarah open the urn, the overhead shots show Giselle handing each item to Sarah. In the side shots Giselle is taking them from Sarah and setting them aside.
Decapitated heads can't speak. Without lungs, they have no means of pushing air through their throats to their (probably damaged) voice box.
When the bewitched mother on the bridge drops the baby off the side, the dummy baby visibly hits the side of the bridge and its hands fly off and splash into the water beside its body.