Thank you for your query,
You continue the medication as advised by your Pediatrician
Increased respiration will be there at the time of fever
and it is fever induced.
Increased breathing even at normal temperature is indicative of involvement of lower respiratory tract
like lung infection
The positional breathlessness may be due to obstruction of the throat by the enlarged tonsils during lying, so try to hold the child in upright or propped up position.
During febrile perion taking milk from a bottle needs extra work and may be associated with breathlessness.
But consult your Pediatrician again for the reassessment and to examine the lungs and appropriate management.
Hope I have answered your query.