How Do You Take Care Of A Baby Opossum. The best thing to do is to find a rescue in your area. For possums under 30 grams mix 1 part formula with 5 parts water.
You must provide a secondary heat source until age 10-11 weeks when they can thermo-regulate on their own. Provide treats to increase your opossums trust. If the babies are a little bigger about 4-7 inches the US Opossum Society suggests that you offer them moistened kitten chow and water in a shallow bowl.
From Raising Baby Animals by Donna Roell OAAO Trustee.
Once they weigh over 30 grams slowly decrease the amount of water until you reach 1 part formula and 2 parts water. Baby opossums lack the ability to suck and have to be fed a special formula via a tube inserted directly into their stomachs. Once the babys eyes and mouth are open you should mix their formula with soft kitten food and offer them the dish to eat on their own. They are very good climbers so make certain that the lid is secure.