It’s really odd. The last 2 pics look a little like a Northern Flying Squirrel instead of the more common Southern Flying Squirrel. Can you look at the belly fur? Is the fur white or cream all the way to the base or does the belly fur have gray roots? A Northern has gray roots and they are larger than Southerns. Size wise I would say Southern though. By the way, at 34grams your baby is extremely underweight. We have a weight vs age chart. Let me find the link.
I’m not sure if it’s just the pic but he doesn’t look well in the last pic. The pinched ears are often a sign of pain or agitation. I am very concerned about his bones. I really think he needs the formula. He just won’t get enough calcium from veggies. When you get the calcium carbonate from Henry’s we need to talk about supplementing with calcium.
Do you have a syringe? You can offer the goat milk/yogurt with a syringe. Often they lick it off of the tip.