plot explanation - Does Elastigirl leave her baby in the car by himself? - Movies & TV

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

src="https://i.stack.imgur.com/cFgv7.jpg" alt="enter image description
here">

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

src="https://i.stack.imgur.com/UK3py.jpg" alt="enter image description
here">

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?

Answer

I'd say that iandotkelly actually
answered this in the comments.

The
most likely thing that happened is that Helen had someone in the receptionist office
watch Jack Jack while the principal had a serious discussion with her about Dash, since
babies can be very distracting to such a talk. It's quite common for parents to bring
their younger kids with them to parent teacher conferences. This probably wasn't shown
or animated because it's such a normal thing for parents that it wouldn't even register
that Jack Jack isn't with her.