Dd is 2.5yrs. Her speech and understanding has always been excellent. She talks constantly about everything! The last week or so she has starting stuttering. Mainly at the beginning of saying something. She will say I,i,i,I over and over again and gets visibly annoyed. The other day she repeated the first word of her sentence over and over then burst out crying as was getting so angry. Is this just a phase or something to look into???