My baby's weight not gaining properly before 1 month it was 5.5kg still now it is same as 5.5kg what are reason behind this?

A. Dear parent, the amount of weight gain varies from month to month. As long as baby is active, alert, passing urine more than 7 times in 24 hours, achieving all growth milestones, doubles the birth weight by 6 months, then indicates good health.