Step 1:
These are pink Sticky note papers.

Step 2:
Valley-fold over these 3 lines, each section
has the same size.

Step 3:
Open the model again.

Step 4:
Fold over these 3 lines

Step 5:
Make the same fold on the other side

Step 6:
Open the model by making a mountain-fold
over this line.

Step 7:
Fold over these 2 lines.

Step 8:
Fold the model in half again.

Step 9:
Open the back of the model and turn it
upside down.

Step 10:
Push this corner to the left by making
an inside reverse fold over these 3 lines.

Step 11:
Valley-fold over this line.

Step 12:
Repeat steps 10 and 11 on the other side,
see arrow

Step 13:
Press the tip flat between your fingers, see arrows.
Do this by making a valley-fold over the 3 blue lines
and a mountain-fold over the 2 yellow lines.

Step 14:
Make an inside reverse fold on the edge,
the short line in the middle is a mountain-fold.

Step 15:
Push the ear upwards, see arrow

Step 16:
Repeat steps 13 to 15 on the other side

Step 17:
Make the same fold on the other side, mirrorwise

Step 18:
Mountain-fold over this line

Step 19:
Make the same inside reverse fold on the other side.
Finally, draw eyes on the model, see final picture.

DONE! The big one is a piggy bank.
                                                                        
                            
 In this How-to-video Joost Langeveld shows us how to fold the baby pig: