Someone gave me some help.

Opossum development chart:

birth- 1 week: about the size of a bumblebee. Teir hind legs are not developed but they have a special claw on their front legs for climbing into the pouch. I have only ever seen one litter this tiny and they are under 1 gram and fit on a penny. There is absolutely nothing you can do for them.

2 weeks: Still tiny, almost embryonic, eyes and mouth closed. Sexes can be distinguished

3 weeks: Their hind legs and ail are becoming functional The babies make a sneezing sound when they are hungry or looking for mom.

4 weeks: They weigh about 25 grams. They are beginning to show the first signs o skin pigmentation and fur growth. They will cry aloud when upset.

5 weeks: Whiskers begin to grow around the mouth

6 weeks: The fur begins to grow on the neck and back- You can now formula feed every 3 hours

9 weeks: They should weigh about 30 grams. Their eyes and mouth are beginning to open. They start to become more active and explorative.

10 weeks. They begin to thermoregulate, but still need a heating pad (he can come out of your bra now Should start taking to a lap bowl. Give formula 4 times a day

11 weeks: They can start to wean onto bits of soft food and yogurt

12 weeks: Need to move to a larger cage and begin climbing and making the clicking possie communication noise.

13-14 weeks: They have all their teeth and should be weaned. Can thermoregulate well.

15 weeks: They start growing fast (like most baby mammals) and are ready to start spending time outdoors in a cage.



To be quite honest, I think that the beginning stages are even slower than this chart shows. So many people just euthanize the tiny ones due to lack of time, money, or success and I don't know how many people have actually kept track of their development. I had my little one for a week and he still seemed to fit the two week old description. It may have been that he had issues or they could grow up slower. This chart is a good guideline though.

I think your guy is probably 3 weeks now because he had hind legs the whole time