When does worry end?

Julie
So my lo is almost 6mo now and I still find myself doing breathing checks on her. If I haven't seen her move on the monitor I go physically lay my hand on her chest to feel it rise and fall. If she is asleep in the pack and play across the room 15 feet from me I still go do breathing checks every 10-15min. When does this worry ever end or does it? Am I the only one being so neurotic about this still?