Answer:
Giggles
Explanation:
Wail can be defined as to: <em>"give a cry of pain, grief, or anger."</em>
Shriek can be defined as a:<em> "utter a high-pitched piercing sound or words, especially as an expression of terror, pain, or excitement."</em>
Growl can be defined as: <em>"of an animal, especially a dog) make a low guttural sound in the throat."</em>
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None of these pass a very good connotation, so we can surely discard all of them and use Giggles, which is: <em>"a light, silly laugh."</em>