[Ger-Poland-Volhynia] Deaths

[Delores Stevens]

I have some family members listed with birth dates and death dates as
follows:
January 18, 1844 - Feb 27, 1848
May 15, 1846 - Mar 6, 1848
Abt 1849 - Jul 25, 1851
Jan 6, 1849 - Jul 25, 1851
Mar 11, 1851 - Aug 6 1851

All of these children were born in Przysypka, Wloclaewek, Bydgoszcz, Poland,
with the first 2 this is also listed as place of death.  The last 3 are
listed as having died in Mariopol, Kutno, Lodz, Poland.  The mother of these
children died the next year Jan 19, 1852 at about age 38.  There are 11
recorded live births.

My question is, was there some diseases that were prevalent at this time
period, or greater political unrest.  If someone could shed some light on a
possible reasoning for all of these deaths in such a short time span, would
be greatly appreciated.

Thank you
Delores Stevens