In the case of a baby-changing mat (10) having an upper side (11), a lower side (12), a first and a second lateral delimitation (13, 14), said lateral delimitations (13, 14) being mutually opposite, and a front end (15) and a rear end (16), said ends (15, 16) being aligned so as to be transverse to the first and the second lateral delimitation (13, 14), the invention provides that the front end in comparison to the rear end has a taper. Moreover, the invention relates to a baby-changing device (1) having such a baby-changing mat (10), and a straightening device (50) by way of which the baby-changing mat (10) over a geodetically oblique support surface (U) is alignable so as to be geodetically straight. The invention furthermore relates to the use of the baby-changing mat (10) and of the baby-changing device (1).