What age do babies start to recognize items for what they are?

Recognition: At 1 week of age a baby will turn towards the sound of a mothers voice, at 1 month he will smile at a face that is smiling at him, at 4 months a baby will get excited when his mom approaches, and by 1 year many babies will say 'ball' or 'dog' when they see one. If you talk to your child a lot and tell them what things are, they will recognize them sooner.