The dosage recommendation is 1cc per 110 lbs. So I always give slightly more, and I know people that give much more. I typically give new borns 1/10cc. The fawns I worked today were 8 to 10 days or so old, I gave them 1.5/10cc. I use 3cc syringes because they are easier to measure out and discern smaller amounts of meds. On mine, every black mark on the 3cc syringe, at the recommended dosage of ivomec, is good for 5 lbs of deer. So today I used 3 marks which is good for a 15 lb deer, and the fawns probably weighed 10 or 12 lbs. I would imagine the avg. month old would weigh 25 lbs give or take, so I would give 3/10cc. I know alot of guys give alot heavier dose, and I'm not saying it's a bad idea, I just don't, and I don't have worms.