As we saw last week with the giant pandas, huge moms can have incredibly tiny babies. Over at National Geographic, Rachel Becker looks at how the size of a newborn mammal is far more closely tied to what it has to be able to do after it’s born than the size of either of its parents.

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And the winner is...Kangaroo! With a 1/900 newborn to mother ratio!!! (Never mind 44 day gestation)

New born

5 weeks

5 month (Matschie’s tree kangaroo)