The baby girl has been constipated since one month after birth, now passing hard stool eggs, about three fingers thick for an adult, dark green, with occasional black residue visible from undigested food. She defecates every two to three days. Currently, there is a 0.5 to 1 cm fissure in the anus with a white ulcerous surface, causing great distress. Please advise experts, what should be done?

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