The list reads
An ordinary room costs 50 mush, but the Moonbeans aren't guaranteed to breed. The max about of babies they can make is 3, unless you give the female a special item, found in the interactives.
All add-ons:
Blanket - 10 mush (Slightly increases the chances of your Moonbeans breeding)
Basket - 25 mush (Even higher chances for your Moonbeans to breed)
Human bed - 100 mush (100% chance that your Moonbeans will breed)
Glacier Ice Water - 25 mush (Increased random boost chance)
Mystery Green Water - 25 mush (Increased random defect chance)
Go-go Treats - 30 mush (Increased chance for a large Moonbean)
All Grown Up - 50 mush (Your baby-beans are all grown up already!)
Motherly Insight - 50 mush (You now know what genders your baby-beans are, and how many there are)
Magic Wand - 150 mush (You choose the gender of your baby-beans, and how many there are)
Magic Treats - 200 mush (You choose the gender of your baby-beans, how many there are, and what their pelt rarities are)
Custom Builder - 500 mush (You choose the gender of your baby-beans, how many there are, what their pelt rarities are, what colors the pelts are, if the pelt design is from the mother, the father, or both)
??? - ??? (Allows up to 5 baby-beans to be born) (This item is found in the interactives)
Winter 
Night Weather: 
Blizzard Moon: 
