Two yr old hands are closed tight into fists most of the day. why would he develop this behavior? he picks up objects with closed fists, so he can eat

Abnormal: Keeping hands closed in fists may be an indication of a problem with the nerves or muscles. This is something that you should consult a pediatrician about. The doctor can do a physical exam and determine what the next best steps are to fully evaluate the cause of your child's holding his hands in fists.

Clenched fists: It's unclear what caused your 2 year old to act like this. A thorough history and exam is needed to determine the cause and decide whether it is temporary or something more serious.