How do I increase my milk supply?
I’ve been breastfeeding for four months now without any problems until recently. I had a cold so I took Sudafed and ever since then, my milk supply has decreased. I’m lucky if I can pump an ounce and it’s getting really frustrating. What can I do to increase my supply?
Pump more frequently and longer, even if you don’t get anything!
Also there is a herbal supplement called Fenugreek that works (worked great for me!)
Beware, though, it makes you smell like maple syrup.
Make sure you are drinking lots of water and eating well and plenty. Lots of fruits, veggies, protein. Also, make sure you’re getting lots of rest, this helps with supply. If your stressed, relax, stress can decrease milk supply. 
If none of those things work you could try talking with a lactation consultant. They’re wonderful.
Breastfeeding Diaries ~ 7: Low Milk Supply