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..the Alien molted (is that how you spell that?), much like a snake does..
It's just a natural process for the Alien to grow once it's emerged from it's host..
You could argue that it may be a natural process for the Alien, whilst still incubating inside of the host, to store up enough energy in it's body to allow it to grow to it's 9 feet+ once it's sprung from the chest cavity..
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