I know that LO won't fuss if she has a messy diaper. She's 3 1/2 months old and only once has her diaper been the reason she's fussing. Today we were out for about 5 1/2 hours and she only grumbled when she was hungry (twice). When we got home I saw that her diaper had leaked all over the carseat. I knew that I should have checked but didn't.
Definitely a bad mom moment.