SI has been the standard for decades in Australia, but people almost always ask for baby weights in pounds and ounces. Adult heights are the other exception,

SI has been the standard for decades in Australia, but people almost always ask for baby weights in pounds and ounces. Adult heights are the other exception, those are often in feet and inches. My 14 year old knows she's 5'2" but her knowledge of imperial measurements doesn't go much further than that.