Medical Oncologist
CION Cancer Clinics
Mother-to-child hepatitis B and the birth-dose vaccine | CION Cancer Clinics
A mother with hepatitis B can pass the virus to her baby at birth, and the birth-dose vaccine given within a day of delivery protects most babies. For babies of positive mothers, doctors may add an immunoglobulin injection and antiviral tablets for the mother late in pregnancy. This page explains each step, the words on the reports, and what to ask the hospital before the due date. At CION Cancer Clinics, our specialists help you understand your own risk and plan regular liver checks that fit it.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- Why does a newborn need the hepatitis B vaccine on the day of birth?
- What actually stops the virus reaching the baby?
- What happens, step by step, if the mother has hepatitis B?
- The words you will see on the mother's and the baby's tests
- What families often believe about hepatitis B and newborns
- What this page cannot tell you
- Common questions about hepatitis B and newborns
The short answer
Why does a newborn need the hepatitis B vaccine on the day of birth?
Because a mother with hepatitis B can pass the virus to her baby during birth, and the first dose of vaccine works best when it is given within a day of delivery. Given on time, it protects most babies, even when the mother carries the virus.
Why the timing matters so much
A baby's immune system cannot clear hepatitis B the way an adult's usually can. When a newborn is infected, the virus very often stays for life. That long infection, carried quietly for decades, is the main route to liver cancer in India. A baby protected at birth is protected from that whole chain.
What this page covers
This page is about babies born to mothers who have hepatitis B, and about the birth dose every newborn should receive. If you are pregnant and want to know about your own care, read hepatitis B and pregnancy. The full childhood schedule is on the hepatitis B vaccine in India.
A mother who passes hepatitis B to her baby has done nothing wrong. Most women in this position did not know they carried it until a pregnancy test showed it.How the baby is protected
What actually stops the virus reaching the baby?
Protection comes in layers. Each one is decided by the doctors caring for the mother and the baby.
The birth dose of vaccine
The first hepatitis B injection, given to every newborn, ideally within a day of birth. It teaches the baby's body to make its own protection before the virus can settle in.
Hepatitis B immunoglobulin
Ready-made antibodies, given as a separate injection to babies whose mothers test positive. They give immediate cover while the vaccine starts working. Supply in India varies, so ask about it before the due date.
Medicine for the mother
When the mother's viral load is high, a hepatologist or physician may advise antiviral tablets late in pregnancy to lower it. This is a decision for her doctor, made on her blood results.
Finishing the course
The birth dose is only the start. The remaining doses complete the protection.
- Keep the vaccination card safe
- Do not skip a dose because the baby seems well
- Ask when the baby's blood should be checked
Not sure whether this applies to you?
Ask an oncologistFrom pregnancy to first birthday
What happens, step by step, if the mother has hepatitis B?
Testing in pregnancy
A routine antenatal blood test shows whether the mother carries the virus. If she does, more tests show how active it is.
Planning before the delivery
Tell the hospital where you will deliver that the mother is positive. Ask that the vaccine and the immunoglobulin are ready in the labour room, rather than ordered after the birth.
Within hours of birth
The baby receives the birth dose of vaccine and, where advised, the immunoglobulin in the other thigh. Both are quick injections.
The rest of the schedule
Further doses follow at the usual childhood visits. Your paediatrician will record each one on the card.
Checking the baby's blood
Some months after the last dose, the baby's blood is tested to confirm that protection has worked and the virus was not passed on. See checking whether the vaccine worked.
On the reports
The words you will see on the mother's and the baby's tests
- HBsAg
- The surface antigen, a piece of the virus. Positive means the virus is present in the blood right now.
- HBeAg
- A marker that often means the virus is multiplying actively. A positive result in the mother means a higher chance of passing it on.
- HBV DNA, or viral load
- How much virus is in the blood. The mother's doctor uses it to decide whether she needs antiviral tablets before delivery.
- Anti-HBs
- Protective antibody. In a vaccinated baby, a positive result means the vaccine has done its job.
- Birth dose, or zero dose
- The first hepatitis B vaccine, given at birth before the routine childhood schedule begins.
- HBIG
- Hepatitis B immunoglobulin. Ready-made antibodies for a baby born to a positive mother.
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Did you know
India's national immunisation programme includes a hepatitis B dose at birth for babies delivered in hospital. Hepatitis B vaccination is one of the few ways to prevent a cancer decades before it could start.
Commonly believed
What families often believe about hepatitis B and newborns
"A mother with hepatitis B should not breastfeed."
Breastfeeding is generally considered safe once the baby has received the birth dose. Ask your doctor if your nipples are cracked or bleeding, but do not stop feeding on the advice of a relative.
"She must have a caesarean to protect the baby."
Hepatitis B on its own is not usually a reason for a caesarean. The vaccine and immunoglobulin are what protect the baby. The way of delivery is decided on the usual obstetric grounds.
"The baby looks healthy, so the vaccine can wait."
An infected newborn looks completely well. The birth dose works best when it is given early, so waiting for the first clinic visit loses the most useful window.
"If the mother is positive, the baby will be too."
With timely vaccination and, where advised, immunoglobulin and the mother's antiviral tablets, most babies of positive mothers grow up free of the virus.
Being straight with you
What this page cannot tell you
It cannot tell you whether your baby needs immunoglobulin, whether the mother needs antiviral tablets, or what the baby's blood result means. Those decisions belong to the obstetrician, the paediatrician and the mother's hepatologist or physician, working from her actual reports.
Who this page does not apply to
If the mother tested negative for hepatitis B in pregnancy, the baby still needs the routine birth dose, but none of the extra steps here. This page is also not about treating liver cancer. If a parent already has hepatitis B and you are worried about their own liver, read how hepatitis B causes liver cancer.
Where CION fits
CION is a cancer centre. Pregnancy and newborn care happen with your obstetric and paediatric team. If a parent in the family has hepatitis B and liver changes, CION's team can review the reports and plan liver surveillance, and arrange hepatology care through partner specialists.
If the baby has already been born and missed the birth dose, speak to a paediatrician today. Late is still better than never.Questions we are asked
Common questions about hepatitis B and newborns
How soon after birth should the hepatitis B vaccine be given?
As soon as possible, ideally within the first day. The earlier it is given, the better it blocks infection picked up during delivery. Ask the delivery team to give it before you leave the labour ward, and check that it is written on the baby's card.
What if the birth dose was missed?
Give it as soon as you can and then continue the normal schedule. A late dose still helps, even if it gives less protection against infection from birth. If the mother is positive, tell the paediatrician, because the baby may need a blood test later to check for infection.
Is the vaccine safe for a newborn?
Yes. The hepatitis B vaccine has been given to newborns around the world for many years. Mild soreness at the injection site or a slight temperature can happen and settle on their own. A baby with a high fever or who is feeding poorly should see a doctor.
Can I breastfeed if I have hepatitis B?
In most cases, yes, once the baby has had the birth dose. The benefits of breastfeeding are real and hepatitis B is not usually a reason to stop. Talk to your doctor if your nipples crack and bleed, or if you are on any medicine.
Is hepatitis B immunoglobulin always available?
Not everywhere. Some hospitals stock it and others ask families to buy it beforehand. Ask the hospital where you plan to deliver well before the due date, so it is ready in the labour room. Prices vary, so ask for the cost in advance.
How will we know if the baby is protected?
Some months after the final dose, a blood test checks two things: that the virus is absent, and that protective antibody is present. Your paediatrician will tell you the right time. Doing it too early can give a misleading answer.
Do brothers and sisters need testing too?
If a mother is found positive during this pregnancy, her older children and her partner should be tested, and vaccinated if they are not protected. This is routine family care, and nobody is to blame. Read should my family be tested for how to go about it.
Does a baby with hepatitis B grow up to get liver cancer?
Not necessarily. A long infection raises the risk over a lifetime, which is why prevention at birth matters so much. A child who does carry the virus can be monitored and, when needed, treated by a liver specialist, and many live long, ordinary lives.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
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Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Sources
- World Health Organization — Hepatitis B
- NHS — Hepatitis B
- National Viral Hepatitis Control Program (MoHFW) — National Viral Hepatitis Control Program
- NIDDK — Hepatitis B - NIDDK
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Hepatitis B and pregnancy: protecting the babyThe mother's own care before and during deliveryThe hepatitis B vaccine in IndiaThe full schedule after the birth doseDo I need a booster? Checking whether the vaccine workedThe blood test that confirms protectionShould my family be tested for hepatitis B?Partners, older children and parents of a positive mother
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Worried about hepatitis B in your family?
If a parent has hepatitis B and you want their liver reports reviewed or surveillance planned, our team can help you find the next step. One helpline serves every CION centre.