"Two weeks? A term? Who knows," she captioned the video, suggesting that she had no idea long the food had been left inside before it had rotted into the disgusting mess.
She added the hashtags, #Kidsaredisgusting and #Getthembacktoschool.
Natalie's fellow Sunrise host Sam Armytage commented on the post, writing "OMG" alongside a nauseated-face emoji.
While the Morning Show host Kylie Gillies, who also is the mother of two boys, wrote: "No. Words."
One of Natalie's Instagram followers suggested that a rotten apple was to blame for the extent of the mould.