What is it that makes you feel like your supply is low? If LO is having enough wets and poopies a day, and LO isn't fussy after eating, you are probably okay. Explain to me what "go out" means...are you leaving for long periods? If you are going to be gone longer than 2 hours, it's best to pump while you are gone. In order for your body to keep producing BM, you need to be effectively emptying the breast often. Try BF'ing on demand and letting LO comfort suck too. This will up your supply if in fact, your supply is low. The more you supplement, the more you need to pump too or your supply could really dip. Are you still supplementing?
Lyric 12.26.08 (Holy sheep! Nursing at 30 months and counting!)
Breastmilk is better than any udder milk! ~Author Unknown