My almost five month old was recently diagnosed with a dairy sensitivity. I don't know if I am refusing to believe it because I love cheese, or if he just has extremely mild symptoms, so I was hoping someone could help me.

Here's his story:
At two months old we introduced formula for the first time, he immediately had a mucusy poop with a little bit of blood in it. We stopped the formula and I just amped up my pumping.
At 3.5 months old we started formula again (because I couldn't keep up with the pumping) and he had no problem.
one week ago he had two poops that had mucus and a little bit of blood.
We went into the ped and they just said "dairy sensitivity" and told me to give him the dairy free formula and cut it out of my diet. The mucus seemed to be out of his poop almost immediately.
He has REFUSED the dairy free formula (both kinds) all week. He went from drinking 12 ounces of formula a day to three. And, even though I tried to just get him on straight breastmilk, he is an awful at nursing and wasn't doing a very good job. He didn't seem to have any noticeable mucus in his poop all week.
So we went back to the pediatrician yesterday and she said to keep dairy out of my diet and put him back on the regular formula to see what happens.
He had one mucus poop last night and today it was normal.

So, does this sound like a dairy sensitivity to anyone else? Is it normal for the mucus to be there one poop and not the next? He is not fussy. He is not all that gassy. He's actually my happiest baby to date. So, even if it is a dairy sensitivity would it be totally crazy to keep dairy out of my diet and keep him on regular formula (since he refused to drink the other kind)?

AH! This makes me crazy. Thanks for any insight or help.