Firstly babies of 7 months do not have any sinuses so your baby cannot have sinusitis as such. He almost certainly has enlarged adenoids which is causing his nose to be severely blocked. So much so that he is having a worrying problem which is called 'sleep apnoea'. The infected mucous from his adenoids is causing a post nasal drip and chest infections. Your baby must be seen by an ENT specialist ASAP. You must tell the ENT about his sleep apnoea problem and the severity of his nose blockage, also that no medicines seem to relieve his blocked nose.Let me know what the ENT decides.
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