EBF, drying up

Little man is 10 1/2 months and my milk supply is starting to dry up I believe. I have been pumping only 3-4 oz a day while away from him on vacation. I am planning to call his pediatrician, however, I’m wondering what is standard at this age. Am I expected to switch him to formula for a month and then wean to cows milk? Or can I go straight to cows milk mixed with what breast milk I have stashed? How did y’all gently wean from the nipple? I am so worried as he is super attached to my boob for comfort.