Not really genius. This is normal yukkuri behavior. Parents should chew-chew the munch-munch for their kids, since their teeth aren't strong enough yet (let alone their bite strength).
Coincidentally, their saliva makes the food sweeter.
Marisa: Just as I thought nanoze
As expected of Marisa nanoze
What a genius nanoze!!Oho! This Marisa finally realizedReimu: Yuwawa it's true! Little ones are happily eating mister food yufufu little ones can't eat hard hard things noze
That's why we have to do this and make them soft for them to eat nozeYuuu~~n?
What are you doing Marisa?
That's little ones' mister food