In a September 1, 1772 session of the Lancaster County Orphans Court, four of Ulrich's children chose guardians. David, Magdalena and Michael are shown as over 14 years old, meaning that they were born before September 1, 1758, and after September 1, 1751 (they are not yet 21). Saloma, also known as Sally, is shown as under the age of 14, meaning that she was born after September 1, 1758. Since the other children are not mentioned, we can assume that they were not minors and were therefore born before September 1, 1751.

With the known dates for Ulrich and Michael, we can estimate the dates of birth as follows:

Elizabeth (sometimes shown as 1740), Anna, Barbara and Catherine were born between about 1740 and 1750.
Ulrich was born May 16, 1751.
David and Magdalena were born between 1752 and 1757.
Michael was born May 26, 1758.
Saloma (Sally) was born about 1760.