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🩺 Childhood Illnesses & Vaccines

Let's learn about your child's 18-month vaccination? (DTaP-Hib Vaccine)

MBBS

Medically reviewed by MBBS — Updated on Jul 14, 2026 · 5 min read

Let's learn about your child's 18-month vaccination? (DTaP-Hib Vaccine)
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Moms and dads, we all know how important it is to vaccinate your little one on time. These vaccines, which are provided free of charge to children under the National Immunization Program in our country, protect them from a number of dangerous diseases. So, do you have any concerns or doubts about the vaccinations given to your child between the ages of 15-18 months? Today, let's talk about all about these important vaccines.

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What is this DTaP-Hib vaccine?

Simply put, this is a combination of several vaccines given to the child at once. This single vaccine protects the child from four dangerous diseases. So instead of having to give the child multiple shots, this protection can be provided in one shot.

1. Diphtheria: This is an infection of the throat and sometimes the nose. It can cause serious conditions such as breathing difficulties, heart disease, and nerve damage.

2. Tetanus: This is a very painful disease that causes the muscles of the body, including the jaw, to tighten. It is usually caused by germs entering through wounds.

3. Pertussis: This is a severe, persistent cough. It is very dangerous for young children, as they can become suffocated.

4. Hib (Haemophilus influenzae type b - Hib): This is an infection caused by bacteria. It can cause serious conditions such as meningitis, pneumonia, and blood poisoning.

So it's great that protection from all four of these diseases is provided by a single vaccine, right?

Things to tell your doctor before getting vaccinated

Before vaccinating your child, it is important to tell your doctor if you have any of the conditions listed below. This will help the doctor decide whether it is appropriate to give the vaccine or if it should be postponed.

Situation to be reported A simple explanation
A severe allergy to a previous vaccine If you have had a severe allergic reaction to a previous vaccination like this.
Diseases of the nervous systemIf the child has a brain or nerve disease, such as seizures.
Guillain-Barre Syndrome If you have had this condition before.
Immune system weaknesses If the child's immunity is weakened due to a disease such as cancer or medication.
Anticoagulant If you give your child blood thinners like warfarin or enoxaparin.
An existing fever or infection If the child has an illness such as a fever or cold on the day of the vaccination.

Side effects that can be expected after vaccination

As with any vaccine, there may be minor side effects after this one. Most of these are nothing to worry about. They are just a sign that the child's immune system is responding to the vaccine and learning to fight off the disease.

However, let's be aware of these two types of side effects.

Serious side effects that should be reported to the doctor immediately
Severe allergy symptoms Skin rash, itching, swelling of the face, lips or tongue, difficulty breathing.
Very high fever If the fever is 39.4 degrees Celsius (103 Fahrenheit) or higher.
Crying that won't stop If the child cries for hours on end, inconsolably.
Seizures Symptoms include the child's body twitching and losing consciousness.
Severe swelling If the arm or leg where the injection was given is completely swollen.
Unusual weakness If the child appears unusually lifeless, unable to move.

If you notice any of these serious symptoms, don't delay. Go to the nearest hospital's Emergency Department (ETU) immediately or call your doctor.

Now let's look at some of the less serious side effects that are commonly seen.

Common symptoms that you should tell your doctor if they persist
Pain at the injection site The injection site may be red, slightly swollen, or feel like a small lump. This will subside in two to three days.
Slight fever If the fever is less than 39 degrees Celsius (102 Fahrenheit).
Irritability/anxietyThe child may be acting a little uncharacteristically, acting a little annoyingly.
Appetite The child may be a little reluctant to eat/drink milk as usual.
Vomiting or diarrhea Mild vomiting or diarrhea.
Fatigue The child may feel a little tired and sleepy.

These common side effects should subside within a day or two. If they persist, or if you have any concerns, call your doctor for advice.

Other medications that may interact with the vaccine

Some medicines can affect the way this vaccine works. So tell your doctor if your child is taking any other medicines, especially:

  • Immunosuppressant medications (e.g. adalimumab, infliximab)
  • Cancer treatments
  • Steroids (e.g. prednisone, cortisone)

💡 Take-Home Message

  • This DTaP-Hib vaccine protects your child against four dangerous diseases: diphtheria, tetanus, whooping cough, and Hib.
  • Before administering the vaccine, tell your doctor about your child's health history, medications they are taking, and any allergies.
  • Minor side effects, such as soreness at the injection site and a slight fever, are common. But be aware of things like severe allergic reactions, high fever, and seizures.
  • It is very important to get your vaccinations on time. Never skip a vaccination.
  • If you have any doubts or questions, don't be afraid to talk to your doctor about them.
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⚠️ Important: Medical articles and information on Nirogi Lanka are strictly for educational and awareness purposes and do not substitute professional medical advice, diagnosis, or treatment. Always consult a qualified physician for any medical concerns.