The longest we have ever experienced with either kid is just the first 24 hours.
Max 24hr . They are really sleepy afterwards
Usually just the rest of that day. Sometimes the day after too
My little boy was a bit off for a day on his first jabs but absolutely fine with the 12 and 16 week ones...all babies are different 🙂
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They might not affect your little one. All little ones are different. Lots of cuddles and calpol. My little one was fine. He felt rubbish after his one year ones for like a day. Xx