DS (6 wks) diagnosed as CMPI last Monday, I've been strictly dairy-free ever since. The GP said it would take 2 weeks to leave my system ompletely & gave us some Aptamil Pepti to supplement with in the meantime.
The difference on the formula was instantaneous - baby was no longer in pain!
But I've been trying to reduce it as my dairyfree days clocked up & now he hasn't had formula since xmas eve. And he was in pain all night and all this morning. Literally sobbing himself awake with the cramping. 
I know the GP said 2 weeks but come on, surely it should be improved?? This is so distressing.