If you are a fresh grandparent and looking forward to host your new grandsons, these are the things you would need to get. If you need a more extensive list consider taking a look at the "What to get for a Newborn"
The swaddlers fit is great for most baby and helps keep "the mess" inside. Also there's a nice stripe indicator which turns to blue when wet. The larger the pack, the cheaper it is, so try to schedule well ahead what and how much you are going to use of each size.
You'll need a place to leave your baby to play and enjoy by himself while you try to make yourself something to eat. This toys in this activity gym are easy to move around. We didn't even plug the batteries. The mirror toy is a nice touch which encourages the baby to some tummy time.