I think wat ur refering to is whooping cough, possible due to anaerobic infection. Diagnosis wuld be more clear on physical examinatoon but since its so chronic there is no harm in goin through course of macrolides that is azithromycin. Expecting weight of 12-15 kg i wuld recomend syp azithromycin for 3 days with added bronchodilator like asthalin syrup for wheezing.
Next Steps
Parents should monitor course of the disease for increase severity and also for fever.
Health Tips
If the child is not feeding well stays dull or inactice or any signs of breathlessness requires prompt evaluation.