For fun, I put Sam in the same outfit Jack wore in this 3 month photo.  Can you tell who is who?

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Ok, the extra hand going “Boop!” gives it away. 

JACK:

SAM:

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(Boop!)

They actually aren’t that different.  I know Sam is humungous for his age, but Jack was big too.  And the difference is just an inch or so.  I think Jack had more limbs, and Sam more belly.  But both boys are big and perfect!