Is that the Step 2 one?

It may make her constipated, so watch out for that. I had to put DD back on Step 1 (newborn) formula because she was constipated for a couple of weeks and nothing else was working to get her 'moving' again. I won't be changing back to Step 2, will stay on newborn until she goes onto cow's milk.

Can you go and get a tin of her normal formula today and just use half and half or something until the other tin is used up? One bottle of it straight probably won't hurt her though.