We co-sleep with 3.5 month old dd at night, but for a variety of reasons, I often put her in her crib for daytime naps. Her naps are rarely more than 45 mintutes long, regardless of where she is sleeping (stroller, carseat, or in our bed or arms). Yesterday, I went upstairs to her room at about the time I expected she would be waking up, and I peeked in. I saw her lying there, staring at her mobile and looking all around, smiling and happy. She didn't see me, so I tiptoed out, went back downstairs and continued what I had been doing before. It was FIFTEEN MINUTES LATER that I heard the first "unhappy" sound from her, and of course, I ran upstairs and scooped her out of the crib right away. She never cried, and she was instantly thrilled when she saw me. Why do I feel guilty about leaving her in the crib for those fifteen minutes though she was clearly "fine?" Would you have done the same, or would you instantly pick up a baby if she/ he was awake?