LO seems to be having excessive saliva in mouth

Carrisma • You can be anything in this world , I chose to be a mother
Is anyone LO have an excessive amount of saliva? Like so much saliva it seems like LO is choking? Or does noises as if LO is drowning? 
I get so scared after feedings (that's when the drowning noises usually begin) I literally stay up all night making sure LO still is able to breathe through the choking episodes. 
Of course I prop LO up after feedings for at least an hour before laying LO down but still Lo seems uncomfortable 😣