Oh, one more! Baby sign language! It sounds like a joke and I scoffed at it initially. They get to a point where they know want they want or need. They just don't have the vocal ability to tell you. That's where the frustration and tears come. Baby sign language is amazing. We got away with just four or five simple things, like yes, no, more, and thank you. Awesome!
If you're in DM, bring new child down to Farmer's Market. I kind of know the guy that runs the children's barrel train on 2nd Avenue. I may be able to hook you up with a ride!
our daycare teaches baby sign language and it's been so useful. He could sign for milk starting like 9/10 months or so? Then more, all done, and please. Don't think he's ever done thank you. But super useful and like you said, helps get out some of their frustration at being unable to communicate effectively.