Teddy bear (Fallout 3)

The teddy bear is a child's toy used for play and comfort that is also an item in Fallout 3 and Fallout: New Vegas. Teddy bears are presumably made of a soft light colored fabric and filling.

Unmarked quest: Toys for Tots
With The Pitt add-on, you can trade teddy bears for 30 caps and 10 XP each with Sandra or Midea, depending on which side you chose during Free Labor.

Fallout 3

 * Larger teddy bears can be found in various locations throughout the wasteland. Giant teddy bears can be found in the Red Racer Factory and at SatCom Array NN-03d. The teddy bear at the Red Racer Factory can be found on a hanging tricycle; the player character must shoot the bear down, or jump up to it using the nearby barrels. The giant teddy bear at the SatCom Array NN-03d must be blasted out from behind the wooden boards with a large explosion.There is also an over-sized teddy bear at Olney power station in the "easter egg" bathroom.
 * Collecting different sized teddy bears: You must not have ANY other teddy bears in your inventory before or during the time you have the larger size bear, or when you drop it, it will revert to the default size.
 * Yew's bear charm has the same model as a teddy bear.
 * There are some interesting compositions involving garden gnomes and bears in some locations added by Broken Steel, specifically in Old Olney Underground.
 * Teddy bears can also be looted from feral ghoul corpses sometimes.
 * If one of the larger bears is picked up and dropped more than once it will revert to it's original size.
 * The Teddy Bears can be sold to Midea after completing Free Labor. Wernher claims that she buys them for the baby (she also buys any other toys you have). You receive caps for every toy you give her.

Fallout: New Vegas
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 * You can find two unique teddy bears in the game. One of them is called Mister Cuddles, located in the Nellis Air Force Base. The other one is called Sergeant Teddy, located in The Fort.

Video
How to get the Legendary Teddy Bear from SatCom Array NN-03d l8gkhCmWvts