I probably just laugh it out first.
The second time, i will tell my LO but in a joking tone, 'Ahma so rude hor! How can fart infront of people! Next time ahma fart you tell ahma smelly and rude ok?;
This way, she will know it's rude, secondly, my LO will also know it;s rude to fart in front of people regardless of the butt direction.
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