Hyzyd sucks his fingers almost all the time...is it okay?...should I stop him? Babies generally suck their thumb to soothe themselves, which is good, because they need to learn how to rely on their own resources. The ability to regulate or control one's behavior and emotions is an important developmental challenge. When your child sucks her thumb, she's finding ways to make herself feel better without your help. You don't have to stop your child from sucking her thumb right now. In general, thumb-sucking is more irritating to parents than it is harmful to kids. Your baby will stop when she's ready and has developed other ways of soothing herself. This article relieves me. Now I'm wondering why it usually happens to baby? No one taught them to do so...right? This is the photo of Hyzyd's arm where you see the grey spot. My friend said that it will disaapear when he grows up. It looks like a birth mark but actually it is just the aftermath of his sucking when he...