It really depends on the baby if he/she gets fever aft vaccine. Some babies may fall sick, some doesn't. My boy did not have any fever aft his vaccines so far. You may want to check with ur PD abt whether u need to space out the vaccines. For me, I just follow what my PD suggested, which are to get 5 in 1 or 6 in 1 injections so it reduces the number of injections he will get.