I think any reason is a good reason to factor in when choosing/not choosing to have a child. We contemplated a lot of financial things - including our ability to pay for college educations, and our age/ability to retire when we were deciding whether or not to have another child. We also contemplated medical things - like my health, my husband's health, and the uptick in risks of genetic disorders based upon my age. If our timeline had been different, I would have absolutely considered the possibly having another T1 child into the mix of decision factors. As it was, we had had all the kids we were going to have (3) before my child was diagnosed.