I want your nappy, your booties, and your tricycle

Just lately baby Nathan has been playing Lemmings a wee bit more than is advisable for his health. Despite the 'do not try this at home' warning label, the precocious Brat (TM) is determined to toddle over the precipice of his isometric, levitating playfield in honour of his lolloping, mop-haired, dopey heroes. Because there's no Dirt Devil for eradicating ground-in baby-splatter, we may as well have a dabble at keeping him on track and therefore alive and wailing. This we achieve by laying behaviour-modifying icons in Nathan's crawlspace to steer him to safety or otherwise encourage evasive action.