To sign mittens, make a movement that mimics putting on mittens on each hand by sliding the dominant hand first over the non-dominant hand, which needs to be extended and facing toward yourself. Then repeat the motion on the other hand.
We use mittens to introduce our babies to winter wear.
Begin teaching the sign for mittens when winter begins to approach. Include other relevant winter outwear to make your toddler familiar with the gear needed to head outdoors.