My 2 weeks old has been coughing and having lots of thick bubbly saliva in her mouth and seems to be chocking on it when she is either in a sitting up position or laying flat on her back. I m worried she will choke while sleeping, or inhale fluid. What could this be and what can I do to avoid chocking? I m not sure if she is getting the cold my 3 year old has right now or if it s something else. Thank you.