Maybe ask your doc if you can split up the shots for the 3rd set? Our doc let us do 2 vaccines together and then the other 2 were given 2 weeks later, for both the 2 months & 4 months vaccines. This might lessen any potential side effects.
My son didn’t get a fever with his 3rd set of vaccines but got a fever for his first two. But he was fussier after his 3rd vaccines, he isn’t a fussy baby and didn’t get fussy with his first two, just was very tired and kinda whimpered in pain when he was awake which was heartbreaking. He didn’t sleep as much with his 3rd set of jabs either whereas for his first 2 he was pretty much asleep all day
Havent had my sons yet, but for relief, try Tylenol. First, ask the doctor the amount because it goes by weight for the first 6 months.