Brandy and FLOPica slayed it.
Brandy became the youngest artist period, to have back to back #1s with "I WANNA BE" and "BABY"... and FLOPica took the title the following year with "JUST ONE" and "BEFORE YOU WALK"... she still holds that title.

Not to mention... Brandy held the record for the BIGGEST jump into the Top 5 with "BABY" 60-5... until the digital era started with Kelly Clarkson and them.
Also, BRANDY/FLOPica and The Beatles had the record for the BIGGEST jump to #1, (23-1) and (27-1), respectively... until the digital era started.
Billboard acknowledges them still, since they know the digital era allowed for those jumps to happen more frequently.