My sons did that. Just put some alcohol around it and clean it up and try not to have anything hit it! And like @mommy99630 said..if it doesn't stop or looks worse go to doctor!
I used peroxide to clean it but if it doesn't stop bleeding you have to take your baby to the doctor
It happened to my daughter and then fell 2 days later
Make sure you clean it with alcohol every diaper change and keep it out of your little ones reach , if it continues to bleed , like immediately after cleaning , call your doctor