Thanks for your question on Healthcare Magic.
I can understand your concern.
No need to worry for
pneumonia as he is not having coughing.
Coughing is first symptom of pneumonia.
So pneumonia is unlikely in the absence of coughing.
And 3 days antibiotic duration is too early to decide about effectiveness.
You should give full 7 days course of
amoxicillin.
Fever was subsided so amoxicillin Island definitely working.
Along within amoxicillin, give him plenty of fluids orally, fruits, juices etc for energy.
Don't worry, he will be alright.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.