Babymoon

Babymoon has a couple different meanings, none which apply to this (though the word is still used) -

http://www.dailymail.co.uk/news/article-2273847/Duke-Duchess-Cambridge-jet-19k-week-Caribbean-villa-holiday-Kates-baby-arrives.html

Of course the word moon is involved, thus referencing Diana.  The moon controls the tides as well.