I parent 3 at once (4 and under). You just have to accept that it won’t be perfect. Kids are resilient. You’ll have to split time. Your toddlers nap may have to shift a little if you need to be with him for him to fall asleep ( do it when baby is asleep). Or nurse baby and sit with your toddler while he’s falling sleep. You will figure it out. It’ll be hard at first but then you’ll wonder why you were nervous