Almost all parents worry about the health and safety of their newborn children. In fact, we're evolutionarily programmed to scan our environments for any potential threat to the little life we are now charged with preserving. You might worry that your child will stop breathing in the night. That a car might leap onto the footpath and mow down you and your stroller. Or, even, that you could do something to harm your new baby, like drown her during those awkward newborn sponge baths.