Bethaney Phillips (not pictured) and her husband allow their two young boys to co-sleep with them.Getty ImagesAt 8 months old, our oldest started co-sleeping with me and my husband.Then, when our youngest was 3, he also joined us in bed. At 5 and 7, they're still sleeping with us.Co-sleeping won't be a lifelong arrangement, but for now, it works for us.When he was just 8 months old, our oldest began sleeping in our bed every night.