Stuttering or Stammering
If your child has difficulty speaking and is repeating sounds or hesitating on certain words or syllables then they may have a stuttering problem. Many children experience periods of normal disfluency when learning to talk. Sometimes this is due to the child learning to use language in new ways. Generally it will come and go.
Someone who stutters might repeat a sound or a syllable, especially at the beginning of the word, such as "li- li- like." At other times it can be a prolongation of a sound such as "ssssssee." Or in other cases it involves complete stoppages of speech.