Maybe he is hungry and want to drink more? Mine was colicky also. Brought to PD had probiotics and meds for colic, and has been advised to increase the vol of his milk, and also to monitor if he is lactose intolerance. We took doctor advice by giving him the medication, increasing milk amount and changing to lactose free formula. After that he is doing fine. Maybe bring him to seek another PD advice?
Could it be the milk bottle you're using?
I have just switched milk bottle brand not sure if he is past his colic period now or wad..things are getting better *fingers crossed*
New Mama