Although one of my children was so tiny when she started that the Classic Unders were a tad too baggie on her. I ended up ordering some smaller ones from Next UK. The smallest size they had was 18 months but they fit my rather tiny 10 month old perfectly, http://us.nextdirect.com/en/x5d3628s2#850881. They’re 100% cotton and quite nice. Not as easy as the Hanna Unders for the child to get on and off, though.