Normal speech develops from cooing and babbling to using words in complete sentences. Looking at a typical child’s speech milestones will help determine if a child has a speech delay. According to Healthline, a typically developing two-year-old can say about 50 words. This increases to about 1,000 words by the time he turns three. A child may have trouble pronouncing words or forming the correct sounds. This is different from a language delay, where he would have trouble understanding words and using them correctly in a sentence.