conflicted: when should I tell my boss that I'm not returning to work after baby?

My boss currently thinks I am only taking seven weeks and then returning. However, my husband and I have decided it is best for our family if I stay home. I'm not due until June and they plan to hire a part time/temp person until I get back. I sort of feel like I should let them know so they can find a more permanent fit... when do you think I should tell them? 

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