baby sweat while sleeping

It shocked me as a new dad when I found my newborn sweaty during his sleep. His clothes was so wet that we had to change his clothes as we worried that he may catch a result. We thought the room temperature may be too high, but that was not true as the baby slept in air-conditioned room.
This repeated many nights, so one day, I decided to do a search online. To my relief, it this is normal for baby to sweat during his sleep.
According to online research result, the cause of this may be due to

1. overbundling. This simply means that your baby wear too much clothes. In Singapore, it is hot everyday. It is not necessary for baby to wear too much clothes. 
2. deep sleep cycle. Baby spends more time in deep sleep cycle and baby tends to sweat during deep sleep cycle
3. immature nervous system. For newborn baby, his or her nervous system is still developing and this can cause him or her to sweat excessively while he is sleeping. 

It should also be noted that this can also be caused by problem that need parents' attention.
For example, if baby also sweat excessively during feeding, parents should seek doctor's help as this may indicate heart problem.

Other medical conditions can also contribute to this such as hyperhidrosis. Parents should seek doctor's help right away for this kind of conditions. 

You can refer to why baby sweat during sleep for more information on this.