a young bird, reptile, or fish recently emerged from an egg.

1895–1900; hatch1 + -ling1

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World English Dictionary
hatchling (ˈhætʃlɪŋ)
a young animal that has newly emerged from an egg
[C19: from hatch1 + -ling1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Violet the red-tailed hawk feeding her hatchling this morning.
Through the pores, extra nutrients added to the moistening fluid reached the
  developing hatchling inside the egg.
What was interesting, too, was that hatchling turtles were also able to make
  the same kinds of discriminations.
It reminds her of past work at the hatchling laboratory.
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