
How much are you giving him per feeding and how many times a day?
I purchased two day old calves a couple weeks ago and am thrilled to say they both made it. My secrete....goats milk.

That is what hubby says. I'm not sure how they survived to be honest. But I can tell you what I did.
As soon as we got them home I injected them with oxytetracycline (200mg/ml) under the skin. Then I made a homemade electrolyte. The next day I gave them a bottle of milk replacer made half strength and added a pint of fresh goats milk once a day. (That was all I have as my goat is drying off.) Between feedings I gave them a bottle of my homemade electrolytes with probios. Every day I made the formula a little stronger until I had it full strength.On day three I injected them again as they weren't doing well. I gave one calf some of my goats Nutri-drench in one of his bottles. He didn't like it any better than my kids. By day five I switched from the injectable antibiotic to a powder and gave it to them daily for the next three days in their electrolyte.
My day old auction calves usually die on me between day 7 & 9. Let me tell you I was thrilled when day seven rolled around and they had the scours. Before that they were pooing pure water.

Two weeks have gone by and they are very vigorous!!! They are drinking water from a pail, eating hay and grain with some milk replacer sprinkled on top. The calf that was the sickest head butt me tonight so hard.....ouch!
I don't know if it would work as I did not try it but a farmer from hubby's work told him to feed the calves a handfull of dirt. I hope you are able to pull your calf through.