Hi Heidi, thanks for answers. Frankly speaking it's more of a coincidence... I must say. He was exclusively breastfed when little but I bought one can of powdered formula just to have it at home for any case. As he was a bit colic when little (now I think his colic-like behaviors are more connected with him being spirited touchy and quickly OS) I was trying to make sure I do everything not to worse the situation or make his tummy-problem bigger (so this formula). It's not a specific only-for-prescription product (called Bebilon Comfort instead of normal Bebilon) so I hope there won't be big problems with switching. My befriended GP told me however firstly to switch to next stage formula and than change for normal one, so not to make both changes at once.