Milk protein allergy in baby

Br

Hi! At 2 weeks old my baby was diagnosed with Protein induced proctocolitis.. (milk protein allergy) and she was put on Nutramigen..... she was on that for 2 weeks and her stool still tested positive for blood. So our pediatrician put her on Elecare... her stool is negative for blood with this , but it makes her extremely constipated.

I know it’s a long shot, but has anyone else’s baby had this??

If so, what ended up working for you?

Thanks!!