Pale yellow stool after starting aavin milk-Pls help

Dear friends,

After my kid turned one year, I started aavin milk. Usually his stool will be hard but after i shifted to whole milk, his stool became soft and color turns to be pale yellow. I left it as i understand that it is due to shift in milk. But even after 25 days of usage still he goes so, sometimes five times a day that too in the color of pale yellow. I afraid whether it is mistake in milk or should i consult doctor.

Note: He is normal in activities and didnt show any difference.