My 18 week old daughter has had little pinpricks of blood in her stool. We have ruled out a milk protein allergy. What can it be?

Still milk protein. It is difficult to diagnose food allergy in infants with the standard food allergy techniques. Soy intolerance occurs in 50% of these babies. Many infants also react to partially digested cow's milk protein and need to go onto more advanced formulas. Breast feeding is the best with mom following a strict cow's milk protein free diet.
Dlood in stool18wks. If you have ruled out milk protein allergy, which is the commonest cause of blood in stool at this agit may be a anal fissure and that is self limiting. But other food allegies can cause it as well. Ig it persist see a pediatri gastroenterologist.