I started by signing "milk," "eat/food," "more," and "all done" at each of the applicable meals or times. I then added "Mommy," and "Daddy" once she started speaking those words. Months went by without any signing from her. The books say that the child will begin understanding you at around 7 or 8 months and will start signing as early as 10 months. I would agree that Keira did understand the signs for "milk" and "eat/food" pretty quickly. However, month after month went by without any signing from her.
We went months with her grunting and groaning when she wanted more food. I would passionately sign "more" as I asked her "Do you want more?". To no avail. I thought she would never sign!
Finally in December, Keira began signing rudimentary versions of "more" and, shortly thereafter, "all done." Hallelujah! Mealtime became a much more pleasant experience.
Just last week, she added "eat" to her repertoire and refined "more" to a more precise tapping of her fingers. However, she seems to be very liberal in her signing of "eat." Either that or she is hungry ALL THE TIME!
Mommy: "Where's Daddy?"
Keira (signing): "Eat...eat...eat."
Mommy: "Where's your nose?"
Keira (signing): "Eat...eat...eat."
It very well could be hunger. If so, she's a girl after her daddy's heart.