The idiomatic expression "to stop someone from crying" means to make an effort or take action in order to prevent a person from shedding tears, usually due to sadness or emotional distress. Full definition
It was the only time during the trip that I couldn't stop myself from crying on the spot. (rachelheldevans.com)
It is difficult to allow children the freedom of tears because most of us were stopped from crying when we were young. (positiveparentingconnection.net)
If in the instance your baby does not stop from crying and you think that it is very dangerous for him not to, erase that kind of mentality. (shrewdmommy.com)