I work on a post natal ward, we don't offer Bath demos any more because studies have shown that babies don't have the thermoregularoty mechanisms that children and adults do, basically they can't control their core temperature and can get poorly very quickly as a new born when exposed to extreme temperatures.
I have supported with cleaning babies just a top to toe as for some families it is a cultural thing, but yeah, CB that's why the midwives were shocked, because we now know its not good for babies.