Perhaps she was a giggly baby!

jo·cose (j-ks)
adj.
1. Given to joking; merry.
2. Characterized by joking; humorous.

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[Latin iocsus, from iocus, joke; see yek- in Indo-European roots.]

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jo·cosely adv.
jo·coseness, jo·cosi·ty (-ks-t) n.