u/Pineapple-of-my-eye

I have a brand new 5 day old and a 3.5 year old and I'm having trouble knowing when I should stop care for newborn to care for preschooler. Example, 3 year old needed to pee. She can manage on her own but typically asks for help, dad was busy. Should I stop a feeding session to help or insist she do it herself? Or she's playing and "gets hurt", do I stop to comfort her even if it's not really an injury?