1. What is the reason why babies have trouble sleeping? Nausea in infants is a very common phenomenon, mainly due to the following reasons: 1. Physiological reasons: Babies have imperfect physiological functions and need to adapt to the external environment, and some physiological reactions can also cause them to have nauseous sleep. : Hungry, wet diapers, cold and fever, etc. 2. Environmental reasons: Changes in the environment can also affect the baby\’s sleep. : The temperature is too high or too low, the light is too bright, or