When children are between 2 and 4 years old and still do not know how to speak or are slow to speak, they say a few words, but compared to their peers, they are slower. This is often the case in parents whose children are slow to speak or have problems with language development. Unless parents observe some other problems of slow development, parents can seek advice from medical specialists. So what are the "normal" language problems and what are not normal in the process of language and speech development in children from 2 to 4 years old. The following article will provide useful information to help parents and caregivers detect early language development problems and how to teach appropriate language to children at this age.