My daughter is 3 weeks old and today had some red blood in her stool. Her stool is still yellow, her last diaper looked yellow and seedy but then had some bloody mucus. I plan on cutting out dairy to see if that is it but this is the first time it happened do I need to cut out all dairy or just obvious dairy? She also is gassy a lot and her belly obviously hurts her does that with the blood sound like it's dairy. I do have an over active letdown but I don't know if that would cause this.