When my son was 18 months old and learning to talk, he would precede anything he didn’t know how to pronounce with “ah”. So the letter “W” would be “ah-yu,” and “dinosaur” would be “ah-saur”. A year later, he’s stopped doing that, and I didn’t think this would be something I’d miss. Now, a different habit he has is that when he does something he’s proud of, he’ll look back…