Grimm-Bavaria-Missouri-Montana-Michigan

My grandmother, Cenzie (Crescentia) and her siblings, Lena, Louis, Josef Grimm came from Deggendorf, Bavaria to St Louis MO in the late 1880s. Cenzie married Herman Poetsch and had two sons there.She later moved to Butte, MO with her sister, Lena Stoffel Lauterbach, and married John Weidenfeller.Cenzie and Lena and Louis all eventually moved to Kent/Allegan Counties in Michigan.I am trying to find the birth records of this family in Bavaria with no luck so far (last 20 years).