The problem of constipation developing right after changing from formula to whole cow's milk is a very common problem. To help get the stools soft again, limit the amount of milk baby drinks to no more than 16-24 ounces per day. Cows milk is not like formula or breastmilk, it is a supplement not the only source of food for baby.
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you could stick to max twice a day but should make sure yr LO drinks more water. preferable to switch back to formula though for more nutrients
U can change the brand of the milk. Like for my daughter, I was using Similac but she also very hard to poo, so my pedi introduce Mamil and she poo as normal
Try give them some fruits that help with digestive like avocado, prunes, papaya etc. Give them sometimes to adapt to a new change.
Yuna Liz