It's difficult to determine whether or not babies dream since they can't verbally communicate their experiences. However, studies have suggested that babies do, in fact, dream.
Research has shown that infants spend a significant amount of time in REM (Rapid Eye Movement) sleep, which is the stage of sleep associated with vivid dreaming in adults.
During REM sleep, the eyes move rapidly beneath the eyelids, and the brain activity is similar to that of a person who is awake.
Additionally, studies have observed babies making facial expressions, moving their limbs, and even making sounds during REM sleep, which could indicate that they are dreaming.
Overall, while we can't say for certain whether or not babies dream, the evidence suggests that they likely do