babymoon n. a planned period of calm spent together by a just-born baby and its parents; occasionally, time spent by parents without their baby; (hence) a vacation or holiday taken by a pregnant woman and her partner. Editorial Note: The latter meaning is on the rise in the travel industry. Etymological Note: Sheila Kitzinger claims to have coined the word. (source: Double-Tongued Dictionary)
Further reading
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2008 Boston Globe also cited the BabyMoon in their article Getaways before the kids
http://www.boston.com/travel/articles/2008/05/18/getaways_before_the_kids/
And BabyMoon luxury pre-birth getaways http://www.baby-moon.eu launced a site dedicated to luxury Babymoons