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russell_castro2026-04-18

I just got my 2-month-old son his Pentacel vaccine. I knew there would be side effects, but I was still a bit nervous. After the first shot, he did have a mild fever and cried more than usual, but that only lasted a few hours. I kept a close eye on him for the rest of the day and noticed no other symptoms. This makes me wonder if I should expect any more side effects in the next few days. Anyone else experience similar reactions after their child received the Pentacel vaccine?

1 min read
last active 4/18/2026
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Comments (7)

J
joyce_ford4/14/2026

I'm a nurse, and I can tell you that these reactions are generally mild and short-lived. Make sure to keep your baby comfortable and hydrated, and consult your doctor if you have any concerns.

L
lauren_meyer4/14/2026

When we got our twins vaccinated, we had a small panic attack when they both threw up after the shot. We just kept them hydrated and they were fine the next day. That made us realize the importance of keeping a close eye on our babies.

S
sean_wallace4/14/2026

Our pediatrician said that mild reactions like a fever or increased crying are quite common and usually not a cause for concern. We experienced the same thing with our baby.

S
scott_robinson4/14/2026

We had a few burning questions for our doctor before the shot. They answered all of them with clear advice. I didn't know that you could report side effects to the FDA/CDC. Good to know in case anything serious happens.

M
matthew_dixon4/14/2026

Sounds like you're doing everything right. We didn't notice much with our first child but had a bit more of a reaction with the second. Just keep an eye on the injection site and if anything gets worse or persists for more than a day or two, call your doctor.

A
abigail_andrews4/14/2026

Just a heads up, but my baby had this really strange numbness in his arm where he got the shot. It lasted for a day, but it was weird and funny.

J
justin_robertson4/14/2026

Worth noting: I had some trouble getting my baby to sleep at night after the shot. I had to give her more feedings in the middle of the night to keep her calm.