@YazmynJade thank you I didn’t know that. I’m already soya free cuz I’m allergic :)
No advice but I also had to cut off dairy and my son's GI said it can take up to 4 weeks for it to get out of system so it might still be a matter of time. That said, I'd definitely see a doctor again if there's still blood.
It takes 6 weeks to heal their guts from cmpa so you'll need to carry on being 100% dairy free for a while. Also a lot of cmpa babies are allergic to soya so cut that out too