my baby is crying all nights for last two days. I don't know why.

A. If your baby has been crying all night for the past two days, it could be due to a variety of reasons. Common causes include teething, which can cause discomfort, especially at night. It could also be related to gas or stomach pain, hunger, or even discomfort from a wet diaper or tight clothing. Sometimes babies cry due to separation anxiety or a need for comfort. If the crying continues or if your baby shows signs of illness such as fever or vomiting, it’s best to consult a pediatrician to rule out any medical concerns.