I am also a less-milk supply mama, but I worked so hard so that my 2.1/2 year old son can still enjoy my milk now. I used to pump as much as possible whenever I breastfed him one side, and pumped another side. Also I will do the same at holidays, even 2 ozs, 3 ozs, you can accumulate more if you pump more.
I only pumped maxi 6 ozs each time when my son was 1 year, so your problem is not a problem now. you need not think about adding formular.
Thanks vivienmak, monmantong and pc9's responses!!
Yeah! mama milk is only a dessert after BB is 1 yr's old. I will try to keep up the current supply so that my BB can enjoy mama milk until he don't want.....