As your baby bis 3 months old with cough , it's better for you to get him examined by the pediatrician.One need to find the cause for this Don't use calpol drops which is used for fever

Kindly discuss for your concern

Kindly consult

Consultation with a paediatrician is advisable

For 3 month old baby, avoid self medications. And consult with a pediatrician for further medical management.

Can help you, kindly provide me detailed history for proper diagnosis and further management

Calpol drops have no affect on cough and congestion in nose.. Calpol Pediatric Drops 15 ml belongs to the class of drugs known as 'non-steroidal anti-inflammatory drug' (NSAID). It is a fixed-dose combination composed of aceclofenac, paracetamol and serratiopeptidase. It can be used for the reduction of pain and inflammation due to bone or soft tissue injury, resolution of postoperative inflammation, oedema and pain.

Consult for proper medications