Yep, I have posted a comment about my 7 week old having 45 min naps too, with a 2yr old spirited DS. Isn't it frustrating? I would love to spend more time with DS1 in the mornings (its his best most focused time), but that is when DS2 has most of his 45min sleeps. He used to resettle himself, not sure whats changed, but I haven't been successful in resettling for the second 40mins as its too difficult with DS1. I have used my baby carrier (which I guess is like your swing!!). Dont have any good suggestions, but would love to hear if anyone else has any!!