We bought a papsan swing when our little guy was 3 weeks old and having really bad colic. I thought it would be great for moments when I needed to put him out of his sling. It was not, it was like baby gitmo for him. We had to take it apart and return it, he acted like it was the most awful experience of his life. I am afraid that your husband is just going to figure out how to get the little one to sleep, maybe he needs to rock her for 30 mins, or an hour even. Parenting just takes this sort of commitment and a swing can't replace us. It is hard sometimes, but our babies need us to make them feel secure and safe, not a swing. Maybe he can try putting her in an ergo, or other baby carrier and face her in, walk with her until she falls asleep, it always works for our peanut. Know that he is a crawler, we wear him for naps, it is so nice for both of us.