Why did the baby Metroid get so big?

Why did the baby Metroid get so big? In the Super Metroid comic, Armstrong Houston suggests that the creature was heavily exposed to Beta-Rays which resulted in its unnatural size increase; since the baby was the only existing Metroid during Super Metroid’s events, it is probable that the Space Pirates resorted to using an excessive amount of beta

In the Super Metroid comic, Armstrong Houston suggests that the creature was heavily exposed to Beta-Rays which resulted in its unnatural size increase; since the baby was the only existing Metroid during Super Metroid’s events, it is probable that the Space Pirates resorted to using an excessive amount of beta
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