Disposable diaper

A disposable diaper comprising:

• a basic absorbent batt structure;
• at least one supplementary absorbent batt structure;
• said basic absorbent batt structure having a liquid-pervious body facing surface and a liquid-impervious garment facing surface, and a front waist region, a rear waist region and a crotch region;
• said supplementary absorbent batt structure having a liquid-pervious body facing surface and an opposite lower surface, and a proximal end portion and a distal end portion, and being placed upon the body facing surface of said basic absorbent batt structure, said proximal end portion lying said front waist region while said distal end portion lying said crotch region;
• an elastic member under an extension in a transverse direction extending in said transverse direction across the diaper along a zone of said distal end portion of said supplementary absorbent batt structure rather adjacent said proximal end portion thereof and having transversely opposite end regions substantially connected to side edge regions of said basic and supplementary absorbent batt structure;
• and
• contraction of said elastic member causing the side edge regions of said supplementary absorbent batt structure to be pulled nearer to a longitudinal center line of said diaper so that said distal end portion of said supplementary absorbent batt structure curves so as to delineate a circular arc which is convex upward with respect to the body facing surface of said basic absorbent batt structure and consequently a pocket opening from said front waist region toward said crotch region is formed between said basic and supplementary absorbent batt structures.