Not sure about nannies, but almost all Chinese confinement ladies don't speak English at all. I am 15 weeks and just got one booked - like everything else in HK, I was told to start looking and interviewing 5-6 months before the due date. I am thinking to hire a domestic helper who has experience with newborns instead of a nanny after the confinement lady finishes. Sorry not being of much help here.