My grandson is amazing he walked at 8 mnths talked clearly  at a early age my boys never spoke clearly till they were older mommy is working on potty training he is doing his temper tantrums real good  but this last week when tired or frustrated started stuttering now this week it is all the time he gets to exacperated he says you say it mommy we looked up on online that it can be teporary that this is normal it just breaks my heart to see him struggel  has anyone else experianced this ?