hello dr my baby boy is 4 months old,,he is bitting his hands almost the whole day so can be this a sigh of teething?

A. Your Baby Is Teething If your baby is between the ages of 4 and 7 months, chewing on their hands could be a sign that they're teething. Most babies start teething between 4 and 7 months, but some babies begin teething as young as 3 months old.