If you've ever babysat, given birth to one or can remember what it was like being a little girl you'll know the last thing you want to do is anger them.
They might be small in stature but as William Congreve once said: 'Hell hath no fury like an angry 7-year-old scorned'*, right?
*Quote may have been altered*
Well, one adult who should be cowering in fear right now is Donald Trump, because a group of young girls are sueing him.
In January, a group of pre-teen dancers called the 'USA Freedom Kids' became an overnight internet sensation when they performed a reimagined version of a World War I propaganda song called 'Freedom's Call' at a Trump rally.
However, according to the group's manager Jeff Popick, a representative from Trump's campaign revealed they couldn't pay the dancers but offered a table inside the rally where the group could sell merchandise, instead.
But when they arrived to set up their merchandise stall, no such space existed and worst of all their merchandise was stolen while the girls performed.
But wait, it gets worse.
Despite not being able to sell their merchandise, the group agreed to attend another Trump rally in Iowa but at the last minute, the Trump team cancelled on the dancers and they were told not to speak to the press.
As a result, the USA Freedom Kids have filed a lawsuit against the Trump campaign for breaking verbal agreements for performances and having refused to pay the group's travel expenses (which totalled £1,800) after they cancelled.
'This is not an opportunistic thing where we're suing Donald Trump,' said the group's manager.
'We're not suing for emotional distress and all that other stuff that people do when they trump up — no pun intended — when they trump up a lawsuit. That's not what this is. This is tangible dollars I spent under false pretenses.'
The group are now sueing Trump's campaign in Florida, for over £11,000 in damages.
Pay up, Trump.
Watch the USA Freedom Kids' act below: