Is it possible that teething starts in 4 month old baby? My daughter is 4 months and 8 days old, we sometimes feels that she became crancky and try to chew everything that comes near to her especially bottle's nipple.

A. For babies, chewing is a typical sign they're teething and young children (until around age 2) use their mouths to explore the world. But even some older kids develop a habit of chewing. This isn't chewing a favorite food or little snack, but rather inedible objects (clothing, pens, toys) that comfort them.