In canada we can start cows milk at 9 months.. i started giving my baby cows milk to substitute it gradually with breastmilk. is cows milk ok?

Cow's Milk: Cow's milk is not recommended by the american academy of pediatrics for children under 1 year old. Infants fed whole cow's milk don't get enough vitamin e, iron, and essential fatty acids. They also get too much protein, sodium, and potassium. These levels may be too high for the infant's system to handle. Also, whole cow's milk protein and fat are more difficult for an infant to digest and absorb.