an open type disposable diaper (1) for a child having a body weight of 3000 g or less, having a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, and being provided with an area surrounding the waist front (1a), an area between legs (1b), and an area surrounding the rear waist (1c), the unfolded disposable diaper (1) having an absorbent body (4), a pair of extended fastening members (10) externally in the widthwise direction from the area surrounding the rear waist (1c), extensible limbs surrounding the leg (6) provided along a pair of openings surrounding the legs (hl) formed by securing the pair of securing members (10). ) to the area surrounding the front waist (1a) and provided more externally in the width direction than the absorbent body (4), and a target display portion (15) to indicate the position in which to secure the pair of securing members (10). ) to the surrounding area the front waist (1a), the absorbent body (4) being provided with an overlapping region (a) in the longitudinal direction overlapping with the target display portion (15) in the thickness direction, and length (l1) of the target display (15) in the width direction being equal to or less than the maximum length (12) of the absorbent body (4) in the width direction in the overlapping region (a).uma fralda descartável do tipo aberta (1) para uma criança tendo um peso corporal de 3000 g ou menos, tendo uma direção longitudinal, uma direção de largura, e uma direção de espessura ortogonais entre si, e sendo provida com uma área circundando a cintura frontal (1a), uma área entre pernas (1b), e uma área circundando a cintura traseira (1c), a fralda descartável tipo desdobrada (1) tendo um corpo absorvente (4), um par de membros de fixação (10) estendidos externamente na direção de largura à partira da área circundando a cintura traseira (1c), membros extensíveis circundando a perna (6) providos ao longo de um par de aberturas circundando as pernas (
