Two-month-old babies do not sleep during the day may be caused by hunger state, environmental factors, lack of nutritional elements and other reasons. 1. Hunger state: if the two-month-old baby’s milk feeding is insufficient and the baby is in a state of hunger, it will also affect the sleep and may also cause the baby to not sleep during the day. 2. Environmental factors: if the environment around the baby’s sleeping is too hot, too cold as well as particularly noisy, it will affect the baby’s sleep and cause the two-month-old baby not to sleep during the day. 3. Lack of nutrients: If a two-month-old baby’s body lacks nutrients, such as calcium, it can weaken the inhibitory function of the brain, which may lead to a two-month-old baby not sleeping during the day. It is recommended that parents should first understand the reasons why their babies do not sleep during the day and improve their babies’ daytime sleeplessness according to the reasons. If the baby does not sleep during the day and has persistent crying, etc., he/she should go to the hospital in time and be given targeted measures under the guidance of professional doctors.