Mostly just subbing in to see suggestions - we do a little baby signing but neither of my oldest ever did the milk sign I showed (open and close one hand as if milking a cow.) They used "more" and "all done" and a sign I invented for "light" such as a lamp, light fixture, or the sun.)
We do have a code word though. My oldest he called it nay-nay. It was his first word and the only word he said from 13-16 months. Second ds called it" side". (when he would pop off the first side I would usually say in a cheery voice: "other side?") He was an early talker and it was one of his first words too. He still calls it that even though he weaned around Christmas-time over half a year ago. My breasts are referred to as my "sides."
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Ann, Mommy to 3 beautiful, boisterous boys:
Liam - 6 1/2, Emmett - 4, almost 5
and Callan - 22 months