It is not advised to introduce solid foods to an infant before 4 to 6 months of age because

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All of these are reasons to delay the introduction of solid foods until 4 to 6 months of age. The infants' GI tract may not be mature enough to digest complex carbohydrates and proteins, their kidney function is limited, and they may not be able to sufficiently control their head and neck. Waiting until 4 to 6 months of age helps to ensure that the infant is developmentally ready for solid foods and that their body can handle the new nutrition.

It Is Not Advised to Introduce Solid Foods to an Infant