just switched to cows milk at a year old...

[justkeepingheadabovewater]

My DS has been waking through the evening then night, screaming and hard to comfort since he switched to cows milk a few days ago.
Just wondered if it could be this that is affecting him? He is very squirmy and obviously uncomfortable, but is also teething.
Does anybody have any advice or experince of sudden waking after switching?
He also started taking steps last week and is walking more every day, wondered if that was a factor?
HELP!!! my brain is going round in circles trying to work it out, and I need sleep!!
thanks

What have you switched from? Was it a cows milk based formula because if not the cows milk protein stuff (technical term there!) might not agree with him, and that could be causing the squirmyness?

It was cows milk formula, but had to try several when we switched from BF before I found one that he was ok with tummywise.