4month child can do mother milk feeding more number for times than usual so as to keep him hydrated. it is just a body response to pain followed by vaccination or a viral infection. for fever u can take paracetamol dose to be decided after checking weight.
Next Steps
u can take paracetamol and do temperature monitoring. syrup zinc 20mg/5ml give 2.5ml orally for 14days. consult doctor for proper dosage and examination
Health Tips
if increased sleepiness or weakness, severe vomiting, decrease in urination and reduced feeding. consult pediatrician immediately.