His wife, Mary Louise stated she was a widow on the 1900 census at the Bronx. Louis D. was b. Oct 1889, so Irving D. was alive in abt Feb 1889, and gone by June 1900. According to Early Landmarks of Syracuse, by Gurney S. Strong · 1894, Irving D. was given as a "minor child" at the time of Harvey Baldwin's Will. He was given as b. 1856 in 1860 at Syracuse with his sister Sarah K "Sally" b. Nov 1854; she was on the Jun 1855 census and Irving was not. He was given as b. 1855 in the 1880 census at Manhattan. He prob was b. Sep-Dec 1855, and poss Jan-May 1856. He was the youngest of 13 children.

Names on Harvey Badlwin's Will dated 27 May 1863:
i. Eliza Warner Baldwin b. 1 Nov 1833 (not mentioned)
ii. Charlotte Isabel Baldwin b. 1834 (not mentioned)
iii. Laura Geddes (Baldwin) Morton b. Jan 1836
iv. Harvey Baldwin b. 1838
v. Julia Dodge (Baldwin) Roberts b. Mar 1840
vi. William Irving Baldwin b. 13 Sep 1842 (not mentioned)
vii. Mary Elizabeth Yates (Baldwin) Jones b. 2 Apr 1844
viii. Townsend Burnet Baldwin b. Jul 1846 (minor)
ix. Heron Oscar Baldwin b. 2 Dec 1848 (not mentioned)
x. Cora M. (Baldwin) Parkin b. abt 1849 (minor)
xi. Grace (Baldwin) Ruggles-Johnson b. 22 Aug 1851 (minor)
xii. Sarah Kathleen (Baldwin) Olliffe-Johnson b. Nov 1854 (minor)
xiii. Irving Dodge Baldwin b. abt 1855 (minor)

Note: He is not in Mary Louise's mother's lot, so he has to be here. I am not familiar with this cemetery if somebody local could pls check on an interment date of 1889-1900. Cora was unable to get into her husband's family tomb, so she is prob here as well; I am unsure of her death date, I know it was aft 1880, but the 1900 census at Brooklyn is missing. Her husband was as a widow on the 1910 census at Manhatten. Evidently, Rose Hill is defunct as a cemetery and active as a park. You are advanced to Onondage Historical Society for the "Old Rose Hill Registers", where you are met with "Please fill out the Remote Research Request Form and purchase your time frame amount below." You have to try and figure out how much time it would take for them to find this information, and pay for it in advance. 30 min - $20/ 45 min - $30/ 60 min - $40; 90 min - $60/ 2 hours - $80/ 3 hours - $120/ 4 hours - $180; payment options are on-line, mail in, and drop-off. https://shop.cnyhistory.org/research-center