Is it normal for poop color to change after eating fruit?

Yes, it is quite common for a baby's stool to change color or show streaks of red after consuming pigmented fruits like dragon fruit or watermelon. This is typically just the result of digestion and not a cause for alarm. However, if the discoloration persists beyond a single bowel movement or you notice other symptoms, it is always a good idea to consult your pediatrician to be safe.