From John Rosemond's Parent power.: I will copy what the book says on the subject
in the 3 yr old section it talks about kids seeming to become more Klutzy, where they once were very stable. chidren after the 3rd birthday may seem to trip and fall more often, they may drop and spill things, stutter, walk into walls. this physical and verbal awkwardness arises because the 3 yr old is trying to orchestrate thought, language, and movement. Up until this time, the child focused on each of these developmental areas in relative isolation from the other two. Now, he or she is putting them together in a coordinated system.
Whereas before children concentrate separately on learning to walk and to talk, they now try to walk and talk at the same time. This example, while oversimplified, expresses the essential character of this stage in a child's growth. it is a time of reorganization and integration, and at first the pieces don't work as well together as they did individually.
Unfortunately, parents often react as though the child has suddenly developed a problem. they become anxious, lose patience, and try to help overcome the difficulties. this makes a problem where there was none. the parents' anxiety tells the child something is wrong, and minor difficulties become traps. this is particularly true in the case of stuttering.
the general rule is, have patience and be supportive. if your daughter spills her milk for the 13Th time in 12 days, instead of blasting her self esteem (what's the matter with you? why can't you do something as simple as hold a cup? ) say something like "uh-oh. here, take this rag and help me clean up. I remember spilling my milk when I was 3 yrs old too")
stuttering can usually be prevented if parents take the time to listen and show interest in what the child is trying to say. if your son/daughter starts stuttering, her is what NOT to do:
Don't complete his sentences for him.
Don't say things like "slow down" or "take a deep breath and start over"
Don't discuss his stuttering when he can hear you
don't interrupt him or tell him to come back when he is calm and can talk "better"
talk slowly to children who stutter. if they have trouble telling you something, ask questions they can answer in 3 words or less. if they complain about stuttering, let them know that sometimes even big people have trouble talking.
that is everything it says. I hope it helps.