When the baby is ready for solid foods new foods should be introduced at least four days apart why?

Introducing new solid foods to a baby at least four days apart allows parents to monitor for any allergic reactions or digestive issues that may arise from each new food. This gradual approach helps identify specific foods that may cause sensitivities or Allergies. Additionally, it gives the baby's digestive system time to adjust to each new food before introducing another. This way, any adverse reactions can be traced back to the last food introduced.