I just went through this with a close relative. She was obese and had a heriditary kidney disease but insisted on getting pregnant without losing weight first. Beside all the usual complications obesity causes during pregnancy she was dealing with the real possibility of irreversible loss of kidney function. Family members tried in vain to talk her out of it. Anyone who continued to mention it was considered negative and unsupportive. The baby was a preemie but is okay. She has irreversible loss of kidney function. Her feelings overtook any rational thought.