Need help

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So my little boy has been mellow as it gets since birth.

The last week he has basically cried the whole time hes awake.

Nothing has changed in his diet. He isnt sick and doesnt have any fever.

He did just cut a tooth and I suspect my milk supply may be a little low but he hasnt really wanted to eat longer or more often.

Any similar stories or advice?

I'm about to cry myself