It is not normal for children not to sweat after taking Merlin because Merlin is an antipyretic drug and the majority of children will sweat after taking Merlin to bring their body temperature back to normal. If a child does not sweat after taking Merlin, it is mainly due to the following reasons: 1. The dosage of Merlin is too small, if parents are afraid of the side effects of Merlin, they tend to reduce the dosage for the child, if the dosage is not appropriate, it will not work, thus causing the child not to sweat. 2. If the child is dehydrated and the parents do not give the child timely hydration, this may also cause the child to not sweat after taking Merlin.