18m is a size not available domestically (^-^) *Because this item is also listed on other sites, it may not be available.* Why not create wonderful memories with matching items for siblings or friends? Recommended as a birthday gift! Ships the same day♡ Authentic product, so please rest assured (o^^o) I have other sizes available, so please visit my page♪ ------------------------------ Quoted from the HP below Material 100% Cotton Petit Bateau Online Reference Price 6600 yen (tax included) 6m 67cm 12m 74cm 18m 81cm 24m 86cm 36m 95cm Long-sleeved pajamas full of hearts that will make today's dreams a little more fun -Features of the material- 1x1 rib knit material with excellent elasticity, characterized by a soft texture called "second skin". Uses environmentally friendly organic cotton. -Design features- Heart print, picot lace, ribbon These are long-sleeved pajamas with a colorful heart pattern. They use environmentally friendly 1x1 rib knit cotton material, which is soft enough to be called a "second skin," for a soft feel. This is a recommended item for comfortable relaxation time at home and before bed. ⚠︎Regarding imported clothing products Color unevenness, color differences, and thread mixing in the fabric are not defects. We appreciate your understanding that these are overseas products♡ There is no doubt that they are genuine products, so please rest assured (o^^o)! I also sell rompers, kids' pajamas, women's pajamas, and kids' shorts♡ Please come and take a look (o^^o)