Fever has been up n down for a week?
Or he has recovered from fever only left cough n flu for a week?
Are you bf-ing or give fm?
Pd dont recommend give medicine below 6m though.
Did you went to normal clinic?
Any teething signs too?
Did baby got any injection recently?
Perhaps when you bring lo to normal clinic , babies easily pass virus to each other. So it may on n off fever.
Baby’s immune system is still weak for infants.
Also do look for signs if any teething. Sometimes it can be combinations of teething n fever etc.
You can get infant vitamins c drop to put in the milk bottle.. it will help to boost lo immunity.
If you are giving fm, you can put less 0.5 scoop. Eg 120ml is 4 scoops, you give 3.5 scoops.
Have you started any solids foods yet?
Rae