Though not the softest of nipples, the monoject helps me deliver the formula (condensed milk, goats milk, clover honey and soluble vitamins). I am very careful to not depress the plunger too fast so as to prevent aspiration.
I learned that bunnies of this age, eyes are not opened yet, will eat about 2 times a day and about 2 ml per feeding. Most important feeding time is between midnight and 5 a.m..
Whatever the cc/ml amount, I look to the little one to tell me when it is full and look for signs of a nice rounded tummy when done.