I co sleep with my little man, he's 4 months. I don't do anything special with blankets he just goes under mine with me next to me. The past couple of nights though I'll turn over and notice they are over his head a little bit. It kinda freaks me out. He can now roll over from his back to his tummy and sleeps on his side a little. He can also move the blankets and pillow when he's playing and we're both awake, but I don't want the blankets over his head. How can I make co sleeping and sharing a blanket safer for him?