Dear doctor, My baby is 24 days old now. She is premature and was born in 33 weeks. From two days she has started to spit up milk soon after feeding, twice through her nose, also she coughs in between feeding also in her sleep sometimes. Also she has bubbly thick saliva always. Is it a serious issue? The pediatrician I consulted did not give this much importance, but it looks like she is irritated when she has this thick saliva in her mouth. Is there something I can do to make her feel better. Should I hold her upright after feeding? Thank you.