Individual Details

Most show Hannah's birth as 17 Apr 1849, apparently calculated from her stone. The engraving is strange is that she appears to have been 4y 5m 10d at death - yet the 4 looks almost like a 1 that has been altered. The stone is pictured in a database on Ancestry.com
http://trees.ancestry.com/tree/5694545/person/6290043450

Also in the mortality schedule for Schuyler Co, IL, Eden Twp, 1850 is:
Hannah Lynn, age 2, died Sept 1849 of summer complaint.
She is in fact recorded twice on this page - crossed out once, but written again.

Birth	1847
Death	Sep 1849	Camden, Schuyler County, Illinois

Father	Minard Lynn (1812 - 1855)
Mother	Mary PICKEL (1815 - )
Sibling	William Lynn (1836 - )
Sibling	James Lynn (1838 - )
Sibling	Minor Lynn (1840 - )
Sibling	Robert Lynn (1842 - )
Sibling	Margaret Lynn (1844 - )
Sibling	Thompson Lynn (1848 - )