Thank you for viewing. My son is now over 3 years old, so I am selling this as I no longer use it. There have been no accidents or vomiting while in use. No pets or smokers. Thank you. Holding method: Vertical hold Quoted from the Montbell website: This is a lightweight, compact, and portable baby carrier that can be stored easily. It can be used in two ways: "抱っこ (holding)" and "おんぶ (carrying on the back)," and is designed to reduce fatigue by supporting the weight with the waist. It uses breathable materials to prevent your child from getting stuffy. Ideal for carrying tired children on hikes and outings. It can be machine washed if it gets dirty. For safety, please be sure to read the included instruction manual carefully before use. Specifications 【Material】■Back: 30-denier nylon ripstop ■Shoulder/Waist Harness: 210-denier nylon ripstop [urethane coating] ■Skin contact surface: Polyester mesh ■Hood: Polyester mesh 【Weight】372g 【Color】Navy (MIBL) 【Size】Free size Waist: 59～107cm 【Applicable range】Facing hold: From when the baby can sit up (around 6 months) to 13kg (around 24 months), Carrying on the back: From when the baby can sit up (around 6 months) to 15kg (around 36 months) 【Storage size】Height 15 x Width 22 x Depth 7cm