Maybe you aren't just accustomed seeing a newborn grow rapidly into a toddler. It's just a normal process of a human growing up. There are so many changes both physically and mentally. Some toddlers are picky eaters which is why they are skinny, while some eat heavily. There are things which are a huge factor that affects the growth of a child. Examples of these are the milk, baby blankets , and food. Providing these together with love and care from the parents can guarantee a healthy body for the kid.