ej: It depends if your room very windy at night, if not then no need close window la, air not well ventilated also not good for mother and bb.
JA: Erm, if the rules makes sense then I'll follow. Hahaha. Actually all these rules boil down to logical reasoning, and with the current technology improving there is no need for certain rules anymore. For example, in the old time ppl say cannot wash hair, why? Because hair dryer was not invented then, so anyone who washes their hair have to wait for it to dry naturally and therefore easy to catch a cold. Now there's hair dryer, so immed dry your hair after washing will pose no such risk. Then why no bath too? Because in the past, there is no such thing as water heater, if need hot water to bath, have to mix yourself and the temperature is not maintained throughout bathing (get cold towards end of bathing), now with water heater, one can get hot water all the time. Then in the past, ppl usually share a common bathroom outside and bath at night which is windy so after giving bath body already weak, higher chance to catach a cold also. Now we all bath in the house (usually master bedroom with attached bathroom), if off fan/aircon and close the window before, during and after bathing, much lesser chance for place to be windy. =)