From you description it looks like your baby is perfectly normal. Fever is when temp is more than 99 F. Secondly if your baby is exclusively on breastfeed and passing urine 10-12 times that’s an indication that baby is getting adequate milk. 6.4 kg is good weight for a 2.5 months baby. Regarding 2 mins of feeding- if you have adequate milk 5-10 mins feeding is adequate for baby. Don’t worry about time spend on feeding. If your baby is active passing adequate urine and doesn’t have any breathing difficulty , then nothing to worry about.
Next Steps
Consult your pediatrician if any of the above symptoms are there