Tickle, Tickle Time...

Zoe say's a new word. I like to tickle her and when I do I say"tickle tickle" she laugh and has fun. Two days ago she stared saying tickle tickle. The frist time I heard her say it I was unsure so I said it and she repeated it to me. It's a pertty big and hard word to say but she say's it. Zoe also knows the meaning of it caues now when I do tickle her she say's" tickle tickle" I dont even need to say it anymore she does it for me. How cute she is understand me more, she might not respond or obey but she starting to know.