He got his vaccination in the morning. We went for a walk afterwards, and then he slept for 3 - 4 hours. Then he woke up, drank 200 ml formula (YAY, he didn't do that last time) and then the fever came. He fell asleep in daddy's arms:
Luckily he slept during most of it, and then the fever disappeared in the middle of the night. He was rather unhappy, clearly not feeling well, crying whenever he woke up.
Now he is feeling fine again.