If your child does not understand what you are saying,
then try the following
Show and Say in Simple Sentences
Show: Help child understand by showing him what you mean. Ex., when you say ‘ball’, also show the ball
Say: say what you want to say in a clear voice
Simple: keep it simple. talk in simple sentences instead of long sentences continuously
Sentences: keep your sentences short as appropriate for the child’s level of comprehension. If child is in single words stage, you can talk in two word sentences. If he can speak in two word sentences, try practicing three word sentences with him.
Please try this