Hi Alyson
As you thought

One daughter is showing for them in the 1930 census at Columbus, Franklin, Ohio - Rosemary (although indexed as Rosemay) aged 6 months.
David Morgan, 54, Sexton - emigrated in 1914
Rose C Morgan, 42 - emigrated in 1928
Rosema(r)y Morgan, 6 months born in Ohio
A first marriage for both of them, reflecting the 1928 marriage that you have details for in Birmingham.
Monica
