Does Elastigirl leave her baby in the car by himself?

Notice during the “tack scene” in the principal’s office, Helen is not holding Jack Jack:

Then, in the next scene, while Dash is begging to play sports, Jack Jack is quietly sitting in the back seat:

As far as we know, the Parrs had no friends (presumably b/c they were superheroes in hiding) and did not use a babysitter. (Kari did not come along till Violet hired her to watch Jack Jack so she and Dash could hitch a ride on the Jet.)

Helen is a very loving, protective mother; so where was Jack Jack while she was in the principal’s office?

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