4 to 7 months about baby talking (form babycenter.com) Your baby knows his name now and understands that you're speaking to him when you say it. He'll even respond by turning toward you. He's becoming more attuned to your tone of voice, too. When you sound happy, he'll react joyfully, and if you speak to him sharply he'll become distressed and may cry. He's also beginning to tell the difference between strangers and people he knows, and he may cry when you put him in the arms of someone he doesn't recognize.