Unless you’re a parent, you might not know this. A urinary tract infection can be a pretty serious issue for little ‘uns, especially baby girls. Up to 8 per cent of them are suffering from one at any given time. As it turns out, sitting in a whole bunch of pee is not actually good for one’s bottom parts, and infants are notoriously bad at relaying specific problems they might be having. That’s where the Pixie Scientific smart nappy comes in.