S.
Before making your decision, you might want to consider whether anyone in your, or your husband's, family stutters. Although children around age three often do experience some disfluent speech, if your child has a family history of stuttering, it would be wise to contact a speech-language pathologist. You would definitely want to be sure the speech-language pathologist has experience with stuttering, especially with young children.
One thing I would strongly suggest is to be sure your face does not express concern when your child makes those repetitious sounds. You certainly would not want to create an issue where one may not even exist. The National Stuttering Association has a great website and wonderful resources that are very inexpensive (I think $5.00 per booklet). I have shared many of their materials with my own clients (I am a speech-language pathologist).
All the best to your little interpreter!
S.