PROBLEM TO BE SOLVED: To provide a pants-type diaper for few-month-old babies being easily passed through both legs of a few months old baby, which are opened into an M shape.SOLUTION: In a pants-type diaper 10 for few-month-old babies, side edges of front/back belts 18 and 19 with a waist elastic member are joined with each other at seam parts 20, waist opening edges 22 are formed by upper ends 18a and 19a of the front/back belts, and a pair of leg opening edges 23 are formed by the lower ends 18b and 19b of the front/back belts and both side edges 13c and 13d of a crotch panel 13. When the joining of the front/back belts at the seam parts are released and the diaper is developed planarly, a distance L1 between the upper ends of the front/back belts falls within a range of 300-400 mm, and a distance L2 between a front-belt-side waist elastic member closest to the lower end of the front belt in the waste elastic member traversing the seam parts and a back-belt-side waist elastic member closest to the lower end of the back belt is at least 55% of the distance between the upper ends of the front/back belt.COPYRIGHT: (C)2014,JPO&INPIT【課題】低月齢児のM字型に開いた両脚に無理なく通せる低月齢児用パンツ型おむつの提供。【解決手段】胴回り弾性部材を備える前後ベルト18,19の側縁部どうしがシーム部20において接合され、前後ベルトの上端部18a,19aにより胴回り開口縁22が形成され、前後ベルトの下端部18b,19bと股間パネル13の両側縁部13c,13dとで一対の脚回り開口縁23が形成される低月齢児用のパンツ型おむつ10であって、シーム部での前後ベルトの接合を解いておむつを平面状に伸展したとき、前後ベルトの上端部間の離間寸法L1が300~400mmの範囲にあり、シーム部を横切る胴回り弾性部材の内、前ベルトの下端部に最も近い前ベルト側の胴回り弾性部材と、後ベルトの下端部に最も近い後ベルト側の胴回り弾性部材との離間寸法L2が、前後ベルトの上端部どうしの間の離間寸法の少なくとも55%である。【選択図】図2
