While you are talking to your baby, incorporate some movement. This helps him link two senses together, makes the language and communication more engaging, and is great for the development of hearing and body awareness.
We love wrist rattles and bootie rattles for cause and effect, body awareness, movement, and linking two senses together.
Talk to your baby as you move him in an arc in front of your face or move your face side to side so he has to visually follow you as you talk.