How to Talk With Your Baby

At this stage you should not only talk to your baby but also introduce other communication forms such as singing and story telling. The greater your effort in trying to talk with him, the better his response is likely to be.
Four months. By now more and more communication should be taking place with your baby. You may notice a greater amount of smiling - while his babbling may have a noticeably singsong quality to it, often ranging into a high pitch that delights him as he learns to like the sound of his own voice. There will be lots of repetition to the sounds that your baby makes.
It is important that you always respond to your baby's "oohs" and "ahhs" and whatever other communication methods she is using - respond with your own voice tones. This is your chance to have a "chat time" with your baby and you should take advantage of these times - you are helping him to discover the art of conversation. There will also be certain times when your baby may also not be in the mood for talking. He will turn his head in the other direction and may put his arm over his face. He may be showing signs of anger or frustration by crying out, especially if something is taken away from him.
Five months. As each month progresses you will find that your baby is becoming better at communicating. It's possible that you will notice him imitate some sounds and gestures. By now he'll most likely be able to let you know if he's happy or sad. When attention is wanted your baby will babble until he is given the attention he feels he deserves. Interestingly, if you always respond to his communication efforts (whatever these may be) he'll repeat them whenever he wants your attention this way.
During this month it's likely that your baby will be looking at your mouth moving while you talk. Talk to him from across the room and he'll be able to find you with ease. He is learning to control his vocal sounds as he watches your response to his sounds.