To provide a breast-feeding auxiliary tool preventing a body and a cloth from staining caused by a release of a breast during breast-feeding to an early neonatal baby, a neonatal baby, and an infant.

If a child releases a breast during breast-feeding, the breast-feeding auxiliary tool mounted on a baby bottle enables the cleaning of the released breast milk while breast feeding, and a sewn part 3 is provided on one side of the breast-feeding auxiliary main body 1 to make the following process unnecessary; the baby bottle is made released from the mouth and put somewhere and the breast milk is wiped by a gauze or handkerchief and the like. The breast-feeding auxiliary tool with the flat rubber 2 can keep the baby skin clean.