Just after some advice; hoping to get to a gig in early June when ds will be 5 months old. I'd have to leave early morning & wouldn't be back until around 3am. He's breastfed but taking expressed bottles, MIL due to look after him but he wouldn't be sleeping out, she'd have him at ours.
Is it too young to leave him for that long? If it's ok to go, what prep would I need to do in advance; like would MIL need to shadow bedtime routine or OK to write it down?