Thank you Baby Center, That Explains Everything!

Hello, Kristin!

If your 15-month-old has started whining or screaming, you're experiencing his intense desire to interact with you. Children thrive on their parents' attention, and a toddler this age will do just about anything to get yours. When your toddler gets loud or whiny, kneel down to his level and tell him you're listening. If he keeps it up, calmly say, "I can't understand you when you talk like that. Please use your normal voice and I'll be happy to listen to what you're saying." Eventually, he'll get the message.