Has anyone here supplemented with formula for the long term? Despite doing everything I seems I'm not producing more than 50% of the breastmilk my 10 week old needs. I have this terrible fear that the little milk I have will dry up. I want to keep going (my short term goal is 3 months, but really I'm hoping that when she starts solids we can give up the formula). Any advice from those that have done this before?