Hi! My 8 months old boy used to sleep through the night. But Iately he has been waking up at 3:00am to 4:00am everyday. Why do they wake up at the middle of the night?
Sometimes sleep regression can happen when babies are having growth spurts. They are more alert and more active. It's normal and will go away.
This may be 8-month sleep regression. Have a consistent bedtime routine, Reduce potential disturbances and distractions.