Blood in poop

Hi mom and dads out there! Im a newbie mom and my little pwincess has been pooping blood for the past couple of days. This wasnt the first time it happened and she has been warded before in suspect of bacteria infection. She was given iv fluid and i had to stop feeding her for 3 days till the bleeding stopped, that was 3 weeks ago. It has come back now and we dont want her to get jabbed again by needles, any advise / experience to share? Thanks!