5mls=1tsp. I'd go up to 5mls 3 times a day. When my cat, Max, had a bladder infection over Christmas and was peeing blood, I was giving him 2tsp 4 times a day for the first 3-4 days. When the volume of urine went from a drop to a tablespoon and was no longer bloody, I dropped down to 1 1/2 teaspoon. He's a big guy -- 16 pounds of marshmallow gooey sweetness. A teaspoon for your little one sounds about right. But what I've learned about infections is: you want to hit it hard at first and when you see improvement maybe cut back a bit. When I was a child, whenever the pediatrician prescribed Antibiotics , he always told my mom to double the first dose.