Parenthood comes with its own set of challenges and one of them being which is the right diaper size for my kid? Even though it seems like an easy-peasy thing and most of us probably would go as per the age mentioned on the pack, but let me tell you that you are making your first boo-boo over there. So, what should you do? Well, here is the baby diaper sizes chart by weight and age that should guide you to make the right diaper decision.