My nephew (45 days and 4kgs now, birth weight - 2.6kgs) recently had cold. Coughing and lot of sneezing. Doctor gave antibiotics and maxtra. He is feeding well. But nowadays he keeps gagging often. It's so hard to watch and we don't know why he do this. He gags and cries sometimes. Then he becomes normal for a while. When he gags, His tongue seems to be flailing and he seems to be panicking. It goes on for a while. His urine and stools are normal. His nose gets blocked often and we use nasal drops. Please help with gagging.