Blood in babies stool

Hello.
I posted couple days ago about Kamran having some stomach problems. Doctor diagnosed him with Acid Reflux and put him on Zantac.  He has been also having blood in his poop sometimes. Today he had some blood again. I have cut out all the diary products from my diet. He does not have bloody poop all  the time, just about 4 times since he was born. He is 3,5 month now and exclusively breastfed.  
Has any of your babies had this. I am really worried, but doctor did not seem very concerned.

Thank you

[amberd5191]

I would be worried as well, ask them to do a stool sample to help put your mind at ease. It seems odd to me that they wouldn't be concerned. Lots of luck please keep us posted.

(In a stool sample they will take a full days worth of stools and have you put them in a cup then they will culture it and hopefully see what is causing this).