It is quite common for infants around 7-8 months to experience sudden nighttime crying or screaming, often referred to as night terrors. These episodes can be triggered by fatigue, overstimulation during the day, or simply the developmental process of dreaming. It may take some time to soothe the baby back to sleep; stay calm and provide comfort, as this is typically a normal phase of development that does not necessarily indicate a problem with their daily routine.