The invention relates to an infant or adult diaper. More particularly, the invention relates to infant or adult diaper (10) having a longitudinal centerline (Y) and a lateral centerline (X) perpendicular to the longitudinal centerline (Y) and having a first longitudinal edge (16) and a second longitudinal side edge (18) on either side of and parallel to the longitudinal centerline (Y), wherein the diaper (10) comprises a topsheet (22) and a backsheet (24) and positioned therein between an absorbent core (20), and at least a first longitudinally extending elastic cuff (30a) positioned on one of the longitudinal sides of the topsheet (22) and on the same side than the first longitudinal side edge, and wherein the diaper (10) has a crotch region (B), positioned in between a front region (A) and a back region (C) and the first longitudinally extending elastic cuff (30a) having a crotch region (B), positioned in between a front region (A) and a back region (C), these regions of the longitudinally extending elastic cuffs (30a, 30b) being positioned in the respective regions of the diaper (10), and the first longitudinally extending elastic cuff (30a) having a proximal edge (32), at which the first longitudinally extending elastic cuff (30a) is attached to the diaper (10) and the first longitudinally extending elastic cuff (30a) having a distal edge (34), the distal edge (34) being attached to the diaper at at least one distal edge attachment point (48a, 48d), the crotch region (B) of distal edge (34) not being attached to the diaper (10) and forming a free flap and wherein the diaper (10) comprises a transverse separator (70) being attached to the first longitudinally extending elastic cuff (30a) at a first separator attachment point (74a), the transverse separator (70) extending in a generally transverse direction and being able to extert a force onto the first longitudinally extending elastic cuff (30a), wherein the distal edge attachment point is closer to the longitud
