Myself use薑皂+薑水 for the 1st 3 week, them, the following 3 weeks use薑皂 only. it is ok. and my baby, until now, still use熟水. i heard baby use熟水will not get sick easily....
if u r interested in 薑皂, http://forum.baby-kingdom.com/viewthread.php?tid=2206791