my baby is leaner then most babies, at 4 months what should be his ideal weight?

A. Hello mom Every baby is different and so every baby grows at their own pace as well so not to worry if the baby is been gaining weight gradually since birth and is active for his age and able to achieve his milestones on time there is no worries baby gain around 300 g to 1 KG monthly and by the age of 4 to 6 months they almost double their birth weight