God i say this all the time to mine. Or variations of. Hes 2 in may.
Ie he is throwing a tantrum.
"chill out kid, this is a bit much" idea being im aware youre angry, you can feel angry but im not feeding the behaviour
if he falls over i always say "WOO" immediately with a non panicking face to teach him to figure out himself if he is hurt, in which case he will cry and be comforted
If hes being a whinge bag for no reason at all i tell him he's fed, watered, dry, clean, warm, and entertained, so i tell him "knock it off"
If hes genuinely upset and needing something or comfort then that's different and i know my son and how to assess that quickly.
Context is important but i dont believe in pandering so much that you can't tell a child to stop crying because they're fine.