Baby goat pee smells like smoke

Hello all! So I acquired a 3 week baby goat being fed a milk replacer powder that I am transitioning onto a homemade milk supplement. I have noticed over the past couple of days that his urine smells like campfire smoke? I have raised many a goat and bottle babies and have never come across this. Any ideas! He is now 4?weeks old and acts fine, very energetic and taking a bottle well. He was taken from his mom at birth, they said he had pneumonia but he is doing well now and has lost the wheezing, just for further info