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[Incredibles] Questions about Jack Jack's powers?

Why didnt they believe he had powers at first? He's just a baby so not so hard to believe or assume that he would get his powers later or he already had powers but too young to use them and or know how to use them yet, right?

In the second movie they all found he had powers and were surprised. Did they not see him use any of his powers when he was fighting Syndrome in the air?

Why and how does he have so many powers? Everyone else in the family including his brother and sister only have one.
gpt
>Why didnt they believe he had powers at first? He's just a baby so not so hard to believe or assume that he would get his powers later or he already had powers but too young to use them and or know how to use them yet, righ

Presumably, in the incrediblesverse, powers are generally active from birth. After all, thinking about it logically, they're innate biological traits. Why *wouldn't* they be? Jack-Jack is an outlier, but most supers clearly have powers as a baby.

>In the second movie they all found he had powers and were surprised. Did they not see him use any of his powers when he was fighting Syndrome in the air?
  


No- he was a baby and far away

>Why and how does he have so many powers? Everyone else in the family including his brother and sister only have one.
  


Technically he only has one- he's a shapeshifter. That's just a very versatile power.