A buckle carrier or a sling? If you could not decide here is a perfect option; Neko Half Buckle Sling!
 
Neko Slings Half Buckle Carriers have a snap button adjustment mechanism (same as the Neko Switch) on the waistband to allow easy adjustment to your baby's height and half padded shoulder wrap straps for maximum comfort. Spreadable wrap strap shoulders enables multiple users to share the same carrier easily without making significant adjustments. 
With fully adjustable panel height and width, adjustable neck support and detachable hood, Neko Half Buckle can be used from birth (3.5kg) to 15kg.
Machine Washable (cool) with buckles fastened. 
 
FEATURES:
100% biocotton. Silky soft fabric perfect for a newborn.
Full wrap conversion soft structured half buckle carrier.
Waistband buckle for added comfort and security.
Padded, soft structured waistband like the Switch Baby Carrier. The mild curve to the bottom of the waistband distributes the weight evenly away from your hips and improves your comfort. Adjustable from 66cm to 145cm to suit a broad range of baby wearers. 
Width is adjustable (14cm to 40cm) using snaps along the inside of the waistband.
Height is easily adjustable (29cm to 35cm) using drawstrings on either side of the back panel, away from delicate little legs. 
Detachable hood with built-in neck support strap to allow adequate support along your baby's entire spine.
Long wrap shoulder straps with extra soft padding to provide comfort regardless of the size of your child.
Easy to adjust between users. 
No need to reach for straps and buckles in the middle of your back or your armpits! Tailor the comfort to your own body every time.
Baby Size