Allyssa's first word

"Hi!" Everyday I tell Allyssa "Hi!" about a million times. I greet her in the morning with, "Hi, Allyssa, hi!" Then throughout the day I say the same thing. This week she's been making the "hi" sound very often, but not ever in response to my "Hi!" However, tonight before bed, Daddy said, "Hi, Allyssa!" To which Allyssa responded, "Hi!" with a BIG grin!