Without jumping to conclusions or playing GP, it sounds like Sam could have a mild form of Cow's Milk Protein Intolerance as opposed to lactose intolerance (which is incredibly rare). Our Monster has CMPI and couldn't even cope with Nan HA. He is now on an elemental formula. So you have my sympathies - their tummies get very unhappy

If you are intent on eventually getting Sam onto cows milk (which we are) then it is probably worthwhile establishing whether or not he is intolerant. This is done by taking a faecal sample and dropping it off at a pathology centre. The testing, which does take a couple of weeks, is bulk-billed. From there you will be able to work out a game plan.

Until you know where you are at with the whole thing, I would hang tight on giving him any dairy. The faecal test they do actually measures the amount of blood in the stool. If there is blood present then, depending on the amount, they establish just how intolerant bubs is. So basically, if they are intolerant, their gut gets so irritated that it bleeds, which is why I am suggesting you get it checked out just to be sure. In the event of an intolerance, reintroduction of dairy has to be closely monitored and often guidance from a paediatric dietician is necessary. On a positive note, if he can tolerate Nan HA then the chances are that, if he is intolerant, it is very mild.

I hope this doesn't sound too prescriptive - that is certainly not my intention. I just try and draw peoples' attention to this when I can as it is a horribly under-diagnosed infant ailment often just fobbed off as reflux, colic or lactose intolerance.

I hope this helps and I really hope that your Sam is just sensitive to milk and not intolerant. Feel free to PM me if you want more info on the topic. Best of luck x