never offer a 19 month old an orange when they are still eating a stick of cheddar. they will nod their head enthusiastically, take said orange and then spit the half chewed cheddar in to your palm, still open from offering them the orange. this all happens very quickly. whence there was orange now there is cheddar. also singing ‘tidy up time tidy up time it’s time to put our regurgitated cheese away’ does not entice them to clean the mess away. it is left to you.