How much cow milk does your young toddler drink during the day? How often?

LO is 16 months. For the last 4 months I have been sending a 3-4oz cup of BM and two 4oz cups of wcm to daycare. We just got back from a 10 day vacation where I breastfed on demand. My first day back at work, I only pumped 2oz, so, I'm ready to unplug the cord!

I'm wondering if I should replace the BM 1:1 with wcm or if it might work to simplify my packing and just send two larger cups of wcm.