For years, Hong Kongers have nursed complaints about the growing parade of visitors to their city from mainland China. The mainlanders spit, litter, jaywalk and cut in line, the locals grouse; they talk too loudly, eat on the subway and otherwise flout Hong Kong’s more refined standards of public behavior. Those are quibbles, though, compared with the uproar over the latest mainland invasion: pregnant women flocking here to give birth.

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