Parents are less focused on cleaning and putting things away before they leave when they are worried about an infant/any kids at all so I automatically know it's more work for me when I have a family book. And while the family is here, the adults are worried about the baby, not the kids, so the kids get into more trouble. I had a group leave that had sticky coke on all my kitchen cabinet doors and even some inside the cabinets, TWO EXTRA HOURS TO CLEAN and condition the wood! Kids are messy! I don't mind hosting families but there is definitely an extra cost and they won't be hosted for free!
Additionally, I provide a crib with sheets I need to wash, the whole thing needs to be wiped down and disinfected, the high chair needs the same wipe down and disinfection, and there's a baby bathtub provided plus other baby things that cost money to obtain and clean after they are used! I don't have any of that cost with an extra adult! All I have is one set of extra sheets to throw in the wash on one extra mattress. Babies should get the same extra person cost!
I don't want to host babies for free, this is not acceptable. If an adult was solely bringing their pack and play and it was of no consequence to me because it was six adults and one newborn and nothing really changed, fine. I'll bend. I get that a newborn with parents who bought a pack and play are of little consequence considering they just lay there, drink mom's milk, and have their own bed which requires no washing on my part. But this is NOT the case in my house! And it's not just newborns, it's up to 2 years old! Toddlers can get into a lot of trouble! AT LEAST LET ME CHOOSE WHETHER OR NOT THE INFANT CAN STAY FOR FREE!