Anus has fissures? In a healthy young baby, anal fissures (little cracks in the skin of the anus) can happen after a forceful pooping (poop need not be firm), or after passing a firm poop. When a fissure happens, there may be streaks or spots of blood on the poop. Because young babies poop often, a fissure may take a while to heal up. The parent should talk with a doctor if blood is seen on the poop day after day.