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ever since i went back to work (part time, 2 and 1/2 days a week) my milk supply went down, where as before i made more than enough more than he needed, now its bare minimum, just barely enough, it takes me longer to pump and i can only get 2-3 oz at a time where b4 i could get at least 4-5oz and a time. it also take alot longer to let down, even when i feed him...and it makes him mad. my milk lets down easier when i get enough sleep but it still can take 5min or more sometimes, what can i do to get a better faster let down?