As per title, I've been breastfeeding a week shy of four months. I've always had a plentiful supply and forceful letdown, but now I'm starting to think my supply is rapidly dwindling. Case in point, my DS fed from both breasts at 6pm, very fussy, seemed unsatisfied, and in the end I gave him 2 oz of expressed milk and he finally relaxed. This has been going on for a week, including last weekend where he nursed every two hours for 48 hours.
I'm going to start taking fenugreek and pump after every feeding. What else can I do? And when should I consider supplementing with formula, if necessary?