Anyone under 17-years-old must be accompanied by a parent or adult 21 or older after 2 p.m., according to mall officials.
FIRST REPORT: Willowbrook Mall announces temporary 'parental guidance' rules
This marked the first Saturday with the new rule that will be effective next Saturday, May 9, as well.
Mall officials said those who cannot provide a valid ID showing they are at least 18 or older must be accompanied by a supervising adult in order to stay at the mall.
One adult can accompany up to four visitors under the age of 18, but must always stay with them, according to the rules.
This comes after a teen flash mob last weekend ended in two girls being detained by police inside Willowbrook Mall.
A video circulating on social media showed two girls fighting as crowds gathered to watch.
Houston police said they detained and cited two girls for fighting at the mall.
"Never know what's going to happen. Anybody can get hurt," parent Stephanie Trevino said.
Trevino said she and her daughters come to this mall often.
"We want to come around in a safe environment," Trevino said. "We don't want to be feeling some type of way, like we're not protected."
Ultimately, Trevino said she agrees with this decision and hopes it deters any future issues at the mall.
"Maybe people understand, like, come better with your actions," Trevino said.