Oh! I saw one of these that I loved! I cannot remember what exactly it said now (why don't I save these things!?), but it was something like this:
Welcome to our home. We appreciate your visit and are happy you are here. Because Mom and baby are still adjusting and we thank you for keeping your visit short. Thank you for joining us during this precious time.
I have also heard of people putting a list of things on the fridge that need to be done. Then if people ask if there's anything they can do they have a list they can go off of.