Oh, and this one I just came across: Hawkeye And Anklebiter by copperbadge.
Summary: Clint wants to give his kid the world. Isobel's not complicated; she'll settle for a couple of superheroes and a train set.

Its so adorable! And funny! And... and... here are some quotes instead:

"Why do you have a baby?" Coulson asked through the door.

"A healthy reproductive system and an inability to keep it in my pants," Clint replied.

Coulson opened the door.
----
Clint noticed Coulson's laptop had a spreadsheet open. It was headed OPERATION ENFANT TERRIBLE and had lines already filled in. (Diaper service? Was that something that existed?)

"What did you do?" Clint asked, vaguely aghast and still half-asleep. Isobel, head on his shoulder, let out a burp.

"Don't come to me if you don't want overwhelming efficiency," Coulson answered.

----
"You know who I am?" he asked. She shook her head. "You know who Iron Man is?"

Isobel nodded.

"That's me."

She considered this.

"Are not," she announced.

"Am so."

"Are not."

"Izzy," Clint warned.

"Am so," Stark repeated.

"Are not times a million."

"Am so times infinity."

"It's nice to see a meeting of equal minds," Rogers remarked.
----

Ok, I'll stop now before I just C&P the whole fic. Hehe!

But yeah, adorable funny and a little angsty little fic. I have the urge to podfic it...