Continue breastfeeding and if the situation persists kindly see your paediatrician.

Please note that cough syrups are not to be given to children because they cannot expectorate and most cold and catarrh do not require medication. Most cold and cough both in children and adults are caused by viruses which will run their course with or without any medication.
On what to do..

- keep your child warm

- if there is fever please uncover and give paracetamol in appropriate dose or Tepid sponge to bring the temperature down

- You can do steam inhalation with your baby (both mother and baby or father and baby). Never leave baby alone on steam inhalation
If nose is congested, u can give saline drop in each nostrils to help decongestant the nostril.

- If you have a room heater, you can use it to make breathing easier for your baby.