It all started when the clever little girl, named Marchelinha, decided she didn't want her fingernails cutting and decided to pretend her dad was hurting her every time he came close with the scissors.
Mustering up a fake cry and a throwing in a few pretend squeals for good measure, Marchelinha attempted to 'scare' her dad into giving up his task.
But she couldn't keep up the ruse for very long and ended up dissolving into laughter.
Both dad and baby are then seen on camera as they roll around on the bed in hysterics.
The adorable - and hilarious - video was uploaded to YouTube by Pri-Fla-E Marcelinha Dos Santos Iwama.
It was originally shared by the family on September 7 and has since clocked up more than 1.8 million views.
Unsurprisingly, viewers have shown a lot of love for the cute clip, with one YouTube user writing: "This is the cutest thing! Plus she's so adorable! I was smiling the whole time."