Corrected entry: Barney's brother's child is now a girl. At his wedding in a previous season the child was a boy.

How I Met Your Mother (2005)
1 corrected entry in season 7
Starring: Alyson Hannigan, Cobie Smulders, Jason Segel, Josh Radnor, Neil Patrick Harris
Subway Wars - S6-E4
Revealing mistake: When Ted uses his laptop to get directions to the restaurant, Bing shows Los Angeles (where it's filmed) as their current location, instead of NY where the show is set. (00:02:15)
renanmisterSuggested correction: Depending on the location settings on his laptop, they could be giving a false reading. My laptop shows I'm in Cardiff Wales while in fact I'm nowhere near.
Ssiscool
The show was actually filmed on a film set in Los Angeles which is probably why the laptop says Los Angeles as the current location. This most probably slipped past the editing crew.
Barney: It's gonna be legen...wait for it...dary!
turtleygleeky02Chosen answer: In a flash forward scene in Season 8, it shows him with his first born: a daughter.
XIIIAnswer: Ted's daughter is older as revealed in a flash forward in 'Trilogy Time', when Ted is with his then-only child: a daughter.
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Correction: This child is barely 6 months old. Barney's brother obviously adopted TWO children. A boy and a younger girl. Taking note of your comment "previous season." In fact it has been 5 years (this previous episode is in season 2).
XIIIThis is true, he has 2 children. Eli and Sadie.