Alternately, it could be parents whose babies really struggle to fall asleep by themselves that are more drawn to the method, making it look less effective than it is. And, of course, the difficulty of studying something like sleep training is that even in a randomised trial, parents assigned a controlled crying method may decide against it – so a "perfect" study is impossible to set up.

อ่านต่อเพิ่มเติม  โรงเรียนวัดอรุณรัตนคีรี

สาระสำคัญ อากาศ