The balloon is made of two kinds of prim: several spheres and a cylinder

1°) Right click and choose Create
Select the cylindre then click somewhere in-world. It will create the object.

2°) You change the size of your cylinder: X = 0037 Y = 0033 Z = 1367
      Remember that this prim will be the root prim and will always be linked last

4°) The neck of the giraffe is a sphere.
You change the size of your sphere : X = 0.585  Y = 0.133  Z = 0.133

5°) The head of the giraffe is a sphere.
You change the size of your sphere : X = 0.257  Y = 0.133  Z = 0.133

6°) ears of the giraffe are spheres
You change the size of your sphere : X = 0.145  Y  = 0.062  Z = 0.062

7°) the beginning of the tail is a sphere
You change the size of your sphere : X = 0.159  Y = 0.096  Z = 0.096

8°) the end of the tail is a sphere
You change the size of your sphere : X = 0.166  Y = 0.031  Z = 0.031

9°) legs are spheres
You change the size of your sphere : X = 0.460  Y = 0.109  Z = 0.109

10 °) Color your giraffe: in Texture tab choose blank as texture and pink as color.

Transparency = 50
Glow = 0.02

11°)  change the texture of your stick

To link the prim, hold down the Shift Key and select one prim. While still holding down the Shift Key and click on the second prim then press Ctrl + L