I've just come back from a toddler group. I asked someone to watch my child for 2 seconds while I fetch the other from the car. She said yes (I know her and trust her). Next thing her child hurts herself - I presume because she was busy with my baby. I feel super guilty. I will never ask someone to watch my kid for 2 seconds ever again. AIBU? I'm so ashamed of myself. On top of that I cried in front of everyone. I don't want to return.