One month: Your baby will understand speech long before he can speak. From birth he will look at your face and listen to your voice. He will likely remember your voice from pre-birth. Mom, dad, and other household members will all be recognized by voice.
She will start to make little noises that you will associate with different needs. Baby's learn from a very early age that certain sounds produce results. He will continue to make these sounds as long as the desired result is the same. (Keep this in mind when you are dealing with day to day activities. If you pick baby up every time he whimpers, he will expect this result with the slightest whimper)
A Side note about picking baby up all the time. Many people will tell you that your baby will not develop properly if you carry him around all the time. You will have to research this and make you own decision. It is my opinion that babies are fun to hold and I held my babies every opportunity I had. They developed just fine. As a matter of fact, they excelled.
Your baby's cry is his first form of communication. Crying lays the foundation for speech as your baby learns to control the air that comes from the lungs and learns how to use his vocal cords. Crying is your baby's way of telling you that he is hungry, upset, cold or tired. If you listen to your baby, you will soon learn which cry is for which need. Your baby is communicating with you.

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