Being the method of watching the quantity of the breast milk which is consumed by the infant being nursed from the breast, the method of including with the step which decides the fluctuation of capacitance of the breast which is in the midst of nursing and fluctuation of the aforementioned capacitance the step which it correlates to the quantity of the breast milk which is consumed by the infant.< Selective figure > Figure 1乳房から授乳される乳幼児によって消費される母乳の量を監視する方法であって、授乳中の乳房の静電容量の変動を決定するステップと、前記静電容量の変動を乳幼児によって消費された母乳の量に相関させるステップとを含む方法。【選択図】 図1