Does lower limb paralysis affect ability to have baby?

Generally not, but. It makes a difference depending on the underlying cause for the paralysis. If the paralysis is due to trauma or congenital problem, shouldn't affect fertility. If due to an underlying systemic disease, such as vasculitis, autoimmune disorder, multiple sclerosis, ...It may. As usualy, need to see primary care physician, gynecologist, probably neurologist, maybe endocrinologist.