The invention relates to an absorbent article (1) comprising: a temperature sensor (5), and at Least one temperature change material (6) arranged such that it is capable of affecting a temperature change due to a supply of excrement, and such that said temperature sensor (5) is capable of being responsive to said affected temperature change. The invention relates also to a system for detecting a supply of excrement into an absorbent article (1), said system comprising an absorbent article (1) according the invention being arranged to generate an output signal representative of the temperature, and a processing unit (8) adapted to process an output signal generated by the temperature sensor (5). The processing unit (8)is adapted to determine a change of temperature, wherein said change of temperature is affected by the temperature change material (6), and detect a supply of excrement into said absorbent article (1) based on said change of temperature, whereby the supply of excrement is associated with a change of temperature. Further, the invention relates to a method of detecting a supply of excrement into an absorbent article (1), wherein said absorbent article (1) is an absorbent article according to any one of claims 1-22, said method comprising the steps of determining (100) a change of temperature, wherein said change of temperature is affected by the temperature change material (6) and detecting (200) a supply of excrement based on said change of temperature. The invention relates also to a kit comprising an absorbent article and a temperature sensor, wherein said absorbent article comprises at least one temperature change material arranged such that it is capable of affecting a temperature change due to a supply of excrement, and such that said temperature sensor is capable of being responsive to said affected temperature change when arranged in contact with said absorbent article.
