Quote from prmenrs
Babies do not have a lot of ways to tell you something's not right--it's very subtle.
Babies have MANY ways of telling you something is not right, so I am going to disagree with the above post. The ways are subtle but an RN with the proper training knows that yawning, hiccups, mottling, changes in gaze are just a few of the ways that invents say "hey, i'm overstimulated, hurry up and let me rest".
People also don't realize that it's best to offer one comfort measure at a time. Rocking + pacifier + talking to a baby all at once can actually make things worse!
With all that being said, trust whoever orients you, ask lots of questions, and make sure you know your medication calculations. Always always always check your meds!