Protection from birth, during those first critical months
In the quiet interval between a child's birth and the completion of their earliest vaccinations, pertussis has long found its cruelest opening. Malaysia, confronting 43 infant deaths from the disease in a single year, has joined more than fifty nations in closing that gap through maternal Tdap immunisation — a programme that transfers a mother's protective antibodies across the placenta, arming a newborn before the world has even had a chance to threaten them. Launched in 2025 and offered free at government clinics between weeks 28 and 32 of pregnancy, the initiative reflects a deepening understanding that protecting the most vulnerable sometimes begins not with the patient, but with those who love them first.
- Pertussis kills infants not through dramatic outbreak but through proximity — parents, siblings, and grandparents unknowingly carrying the bacterium to babies who have no defence yet.
- In 2023, 43 Malaysian infants under five months old died from the '100-day cough,' a toll that made the protection gap between birth and completed vaccination impossible to ignore.
- The Tdap vaccine, administered to pregnant women at weeks 28–32, transfers antibodies through the placenta and can reduce newborn pertussis risk by up to 93 percent and prevent up to 95 percent of related infant deaths.
- Malaysia's Ministry of Health launched the programme in 2025, offering the vaccine free at government clinics, with uptake described as encouraging across the country.
- Safety concerns have not been borne out — extensive global study across fifty-plus countries shows no increased pregnancy risks, and mild side effects remain well-tolerated by most mothers.
Malaysia has joined more than fifty countries in offering Tdap vaccination to pregnant women, a programme introduced by the Ministry of Health in 2025 and available free at government clinics between weeks 28 and 32 of pregnancy. The move addresses one of the most dangerous gaps in infant health: the window between birth and the completion of a baby's own early vaccination series, during which pertussis — the '100-day cough' — can strike with devastating force.
The numbers that drove the decision are difficult to set aside. In 2023, 43 infants under five months old died from pertussis in Malaysia, representing nearly 44 percent of all cases recorded that year. The disease's cruelty lies partly in how it travels: parents, grandparents, siblings, and caregivers can carry the bacterium with few or no symptoms, passing it to newborns who cannot yet mount a full immune response. Even infants who begin their own DTaP shots at two months remain vulnerable until the series is complete.
Maternal immunisation addresses this directly. When a pregnant woman receives the Tdap vaccine, her body generates antibodies that cross the placenta and reach the baby before birth — providing protection from the very first moments of life. Studies show the approach can reduce pertussis risk in newborns by up to 93 percent and prevent up to 95 percent of pertussis-related infant deaths. The same vaccine also guards against tetanus and diphtheria.
Concerns about safety have not been supported by evidence. The vaccine has been studied extensively across dozens of countries, with no documented increase in pregnancy complications and only mild, manageable side effects for most women. With uptake running strong nationwide, Malaysia's programme suggests that when the science is clear and access is genuine, families will act to protect their children — even before those children are born.
Malaysia has begun vaccinating pregnant women against pertussis, tetanus, and diphtheria—a shift that places the country among more than fifty nations using maternal Tdap immunisation to protect newborns during their most vulnerable months. The Ministry of Health introduced the programme in 2025, offering the vaccine free at government clinics between weeks 28 and 32 of pregnancy, with private options available for a fee. Uptake has been strong, reflecting growing confidence in a strategy that medical professionals say is both safe and essential.
The urgency behind the programme is stark. Pertussis, known colloquially as the "100-day cough," poses an outsized threat to infants too young to have completed their own vaccination series. In 2023, Malaysia recorded 43 deaths from pertussis in babies under five months old—a figure that represents 43.8 percent of all pertussis cases that year. When the infection takes hold in an infant, the consequences can be severe: intense, uncontrollable coughing that starves the lungs of oxygen, turning lips and skin blue. Pneumonia, brain damage, and death follow in the worst cases.
The danger often arrives from those closest to the baby. Parents, siblings, grandparents, and healthcare workers can carry the bacterium in their mouth, nose, and throat, sometimes with only mild symptoms or none at all. Infants cannot mount a full defence until six months of age, even though they begin receiving their own DTaP shots at two months. This gap—between birth and the completion of early vaccination—is where the disease strikes hardest and most invisibly.
Maternal Tdap immunisation closes that window. When a pregnant woman receives the vaccine, her body produces antibodies that cross the placenta and reach the developing baby. These maternal antibodies provide protection from the moment of birth, precisely when the infant is most defenceless. The evidence is compelling: the vaccine reduces pertussis risk in newborns by up to 93 percent and can prevent up to 95 percent of pertussis-related deaths. Beyond pertussis, the same shot guards against tetanus and diphtheria, diseases that can cause serious harm to infants as well.
Concerns about safety have not materialised. Medical experts emphasise that the Tdap vaccine has been extensively studied and is used safely in more than fifty countries worldwide. Pregnant women may experience mild side effects, but these are generally well-tolerated, and no increased risk to pregnancy has been documented. The strategy represents a convergence of global best practice and local commitment: Malaysia is now aligned with leading health systems in recognising that protecting a newborn sometimes means vaccinating the mother first.
The programme's success hinges on a simple fact: mothers want to protect their children from the moment they are born. As one obstetrician noted, vaccination during pregnancy offers parents peace of mind and gives babies a safer start in life. With encouraging uptake across the country, Malaysia has demonstrated that when the science is sound and the message is clear, families will embrace the protection available to them.
Notable Quotes
When infected, these babies can develop intense and uncontrollable coughing that makes it difficult for them to breathe, sometimes causing their lips or skin to turn blue due to a lack of oxygen.— Prof Dr Zulkifli Ismail, consultant paediatrician
Our babies depend on us for protection from the very beginning. Getting vaccinated in pregnancy is an important way to shield the newborn baby from vaccine preventable infections.— Prof Dr Jamiyah Hassan, consultant obstetrician and gynaecologist
The Hearth Conversation Another angle on the story
Why does pertussis pose such a specific threat to newborns when older children and adults can fight it off?
Infants under six months haven't yet built their own immune defences. They can't start their vaccination series until two months old, and they won't be fully protected until six months. That gap is where pertussis does its worst damage—and the people transmitting it are often family members who have only mild symptoms or none at all.
So the mother's antibodies are doing the work the baby's immune system can't yet do?
Exactly. When a pregnant woman gets Tdap, her body makes antibodies that cross the placenta and reach the baby before birth. The newborn arrives already armed. It's a bridge across the most dangerous months.
The numbers from 2023 are sobering—43 deaths in infants under five months. Did Malaysia have a particular outbreak that prompted this policy?
The data showed a pattern, not necessarily a crisis moment. But 43 deaths in one year, with nearly half of all pertussis cases in that age group, made the case clear. The policy was about preventing what could happen, not reacting to what had.
What's the barrier to uptake? Is it hesitation about vaccines in pregnancy?
Surprisingly little. Uptake has been encouraging. The vaccine has been used safely in over fifty countries for years. Once mothers understand that it protects their baby from birth, the choice becomes straightforward.
Does this mean pertussis is now preventable in Malaysia?
Not entirely. But the most dangerous window—those first months of life—can now be protected. It's a significant shift in what's possible.