Formula?

Vy

So I’m leaving my two month old with my mom for a few hours while me and my husband go to the movies. He’s exclusively breastfed and today he’s been cluster feeding all day so I wasn’t able to pump much out I should have started two days ago and built up a small stash but I didn’t. Anyways I have a thing of sample formula my question is will it bother him too much if I sent that with him in case she needs it?