Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1915 1916 - 1928 1929 - 1935 1936 - 1990 1991 - 2008 expectant mother English
1800 - 1810 1811 - 1882 1883 - 1890 1891 - 2002 2003 - 2008 expecting mother English
1800 - 1893 1894 - 1973 1974 - 1980 1981 - 1998 1999 - 2008 pregnant mother English

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