My son is 2 years old ever since he turned 1yr and swithced him to cows milk he has had constipation. i have tried a lot of things that dont seem to work. iam desperate.can i switch cows milk to lactaid whole milk or any other milk will help??

Other factors matter: If his previous formula was cow milk based (similac.enfamil, store brand) the protein remains the same and would not be as likely a cause. If Breast fed or soy, cow milk might be the issue and soy milk or almond milk might help. Bananas,cereals & applesauce are all constipating while apple juice, peaches,pears, prunes are loosening agents.