I've find myself in this situation, a good friend of mine had a baby in the summer and having coffee one morning as we usually do I offer myself to look after her baby when she returns to work. I have one day off a week, this is the day I offered. Might have been looking at her beautiful newborn that did it obviously, but as the time approach I'm feeling overwhelmed by it, but obviously my friend it's counting on me... What do I do? Aibu having seconds thoughts about it?