Left milk out

Jess • Mom of 3 with the 4th on the way! I am also a middle and junior high teacher :-)

I pumped about 8 Oz's this morning at 6 before work and just discovered I left the bottle on my nightstand until 4!! I'd hate to through it away because I'm barely keeping up with my buddy during the week. What do you think, keep it or throw it?

Update: I gave him a milk bath, which my spouse thought was crazy!