Inside a Baby's Head?

When I know it's going to take me a minute or two to get my boys bottle (also 5 weeks) I'll put his pacifier in just so he doesn't scream. He usually sucks on it for a minute or so, then his face gets this look like "Hey, there's nothing coming out of this thing!!" Then it gets spit out and the screaming commences. (However once I soothe him and he sees the bottle coming towards his mouth his eyes (and mouth) open wide and he gets all excited like he's going "Hot diggity dog, here comes the food!!")