Yep! I got a kit from an expo (talking hands? or tiny talk? something like that). TBH I didn't use the kit much. We ended up just using the basic signs.. milk, eat, drink, book, ball, dog, cat, light, hot, please, thank you etc. You can probably just google them and go from there for nothing.

Signing can actually speed up the talking process, so once they started using words, the signing dropped off. The kit had loads of words, but we didn't need it to that extent at all.

It's been great for communication up to probably 2yo. After that they were talking a lot more. I remember the older two had a vocab explosion around 19 months.

Alyssa as you know is signing milk, and has been doing so for a while now. She does the same sign for 'more' atm as well as 'bird' lol. But it's common for them to use a known sign for everything for a while.. it's a sign they know to communicate with their hands. Once it twigs, they can start learning quite quickly.

Enjoy it. You'll find you naturally use signs or gestures anyway that they will pick up on. This is just more deliberate