The problem with this product, which I've tried using with a chunky (10+kg) 6.5 month old, is the size. There is an adjuster at the back, so I thought I could make it fit him but there is no front adjuster, so bringing the back in essentially widens the gap at the front pulling the straps even further apart, making the weight bear more under his arms. The poor baby ends up with his arms out to the side, the fabric that should be in his armpit is more like an inch or two down his arm, where it cuts in painfully. I fear that by the time he's big enough to fit this around his chest, he'll have long been walking. I admit he's young to be using this but he's determined to walk and soon, so I'm desperate to save from bending over all the time.