One thing I've learned as a parent with small children an infants is that the most overprotective parents are also the loudest and seem to get themselves installed in regulatory agencies. A lot of the recommendations you will see as a new parent go well beyond any sane reasoning. We were told we shouldn't give our kids peanut butter until they turn 12, which is patently ridiculous. We were also told that a car seat from 2006 is a deathtrap and must be thrown away, even though there is no specific problem with the seat. We're also apparently bad parents because we don't strap our kids down at night and instead let them sleep on their bellies, which they much prefer. Once they learn how to roll over there isn't much you can do about it anyway. We also let them sleep with blankets, because we don't want them to be cold.
Apparently our kids should have been dead many times over already.
My impression is that a lot of these recommendations come from people taking care of fragile special needs children and that for the general population the don't make much sense.