Very sweet.

Again thank you for making me smile. :)

So sweet

Oh, quite cute.

Aw, adorable! I loved the reason why everyone forgot his birthday; it was really sweet. What could have made it better is if you kind of foreshadowed teh event - mentioned Ginny's pregnancy, for one. But this made me melt inside, so I really enjoyed it :)

Aww, that's adorable! Very sweet idea, having Harry's birthday be on his son's literal one. I think it would have been more effective though if you had done more showing and less telling

This was siriusly epic. :P And yes, I seriously misspelt serious. You have a few mistakes so I've corrected them here:

"I can't believe this. They fucking forgot my birthday," Harry Potter swore out loud in the unoccupied house.

The Aurors department was rather quiet since the end of the war. His colleagues wished him a Happy Birthday, even they'd remembered - but not his friends, his family!

It was now five pm and every birthday since the end of the war, everyone used to wait for him here, at The Burrow with a big cake on the garden tables. He never asked for it - he didn't want to bother people - but he really enjoyed this moments, it made him forget about his awful birthdays, back at the Dursley's.

“Man, you're here! Come, quick!”

Without another word Ron apparated his best friend to Diagon Alley.

He knew his face showed panic when Arthur spoke to him, “Go inside, Harry.” He showed him a room with the number thirty-one, just like his birthday.

Ginny handed him the baby, whispering, “James Sirius Potter would love to wish his father an Happy Birthday.”

“Happy Birthday Harry,” she added, softly, watching him holding their son.

-

Sorry for being so nitpicky! But seriously, this was really awesome and I didn't expect it to end like this!

That was a good way to look at the challenge... I really liked it