Yesterday, I could not get M to settle down. She wasn't hungry, she was just miserable and fussy. I started walking around with her and found she stopped fussing so much when I was in a dark, quiet, cooler part of the house. Duh. She was hot and wanted darkness and quiet so she could nap.

Today I haven't turned on the TV and I closed all of the blinds so it's quite dark in the family room. She's been sleeping in her swing for hours.

What was your latest "duh" moment in parenting?