hello my baby boy is 3 months and 15 days old. his weight is 5 .800. sometimes i found blood type stains in his diaper. another thing i marked that he want to sleep only one side that is right side all night. when i found stains in morning i realized that he couldnt sleep properly last night. his urine test is normal. and pelvic sonography is also normal. then what can be the reason behind this blood stains.(i did not eat any food of red or orange color except tea). plz help