Shoulder straps feature safety buckles requiring two hands - a good choice, given that this is a toddler carrier and sometimes small fingers can be surprisingly strong when playing with clips and buckles! The waist buckle does not have a safety button and can be unclipped with one hand. I found this was a smart feature, as I prefer to lower my 16 kg/36lb child "through" the carrier after unclipping the waist belt.
Overall: Great carrier. Love the design, found it well-proportioned and measures well for plus-size and petite wearers. Buzzidil offer a range of fabrics and styles in hoods which allows you to get a customised SSC straight from the manufacturer - highly recommend! (You may wish to follow them on Facebook ... and you may want to watch MY Facebook page for something special too!)