With increasing frequency, when I finish a blog post, I look back on it with amusement, then with shame, and then I realize that while my blog is supposed to be about bilingualism, what I’m learning and sharing with my audience of 4 is really a set of basic and universal principles of parenting. But I already paid a whole two years of web hosting in advance so I might as well keep writing. One of those basic and universal parenting principles (or facts, rather) is that, just when you think your child is on his or her way to mastering something, they throw you a curveball. You’ll be bragging to your friends about how your toddler has the sphincter and bowel control of…