Hello. My baby was always and is lean. Many relatives thought i dont feed him. But i didnt bother. He was fine as per the chart and pediatrcian. It is because he was lean he was way more active abd flexible. Im proud of him the way he is. Pls do check out helpful articles on milestones on the App. Hope this one is useful http://www.babychakra.com/learn/1101-weights-and-lengths-of-boys-from-birth-to-5-years

dont b worry at all dear bcoz ur baby's weight is absolutly fine as per baby weight chart.