There is no single "best" supplement for weight gain in babies. A healthy diet and regular feeding are the most important factors for a baby's growth.
If a baby is not gaining weight as expected, it is crucial to consult a pediatrician. They can assess the situation, identify any underlying issues, and recommend the most appropriate course of action. This may involve dietary adjustments, feeding strategies, or, in rare cases, nutritional supplements.
It is important to never give a baby supplements without the guidance of a healthcare professional. Unnecessary supplements can be harmful and potentially lead to health complications.
Always follow a doctor's recommendations regarding any potential supplements, including dosage, frequency, and duration.