Taggart favored the left side of his head for about the first 2 months until I noticed that side becoming flat. I changed him around in his crib and wherever he is playing I make sure he is positioned so he should look to the right. We also bought this fun beanie called a Tortle that helps with flat heads. He hates it though and doesn't nap well when he is wearing it. He is always wiggling it off. Hopefully this will prevent him from needing a helmet.