Shouldn't have the child in the front seat of an Explorer. The child should be in the rear seat. It's the safest place in a crash, and is where the seats are designed to protect the children. The front seats (and passenger side airbag) are not designed to do so.
Not to be harsh, but if you're trying to put a child or infant in the front passenger seat of an Explorer, you're driving the wrong vehicle.
-Joe