Has anyone flipped their mattress to the toddler side or started using a toddler mattress? We're on vacation and my MIL got a toddler mattress instead of an infant mattress by accident, and since my son is walking and super strong I didn't fight it. Well he has been sleeping like a log - great all night and super long naps. I can't tell if it's just the fun and stimulation of vacation or the mattress but I'm thinking of flipping his mattress at home to the toddler side because of it. Anyone else do this yet?