It's he knows I'm pumping. *que the crying*

Ash • Married 8.2.2014. 1st Boy 11.24.16. 2nd Boy 8.27.18
I never really get frustrated with my baby. But one thing that drives me nuts, that I've almost cried over, is that EVERY SINGLE TIME I turn on my pump, he cries. Lay him down for a nap, sit down to pump, I hit 5 minutes and he cries. Lay him under his play mat, turn on the pump, he cries. But when I'm not pumping, he will sleep or play without issue. I've literally almost cried because I was so engorged and needed to pump and he wouldn't let me set him down. It's not enough for him to be sitting in front of me. I've spilled and leaked so many ounces trying to unhook early and quickly. I don't understand. It's frustrating!