Tag: maternal antibodies

Is the MMR Safe for 6-Month-Old Babies?

Most parents understand that the first dose of the MMR vaccine is routinely given to children when they are 12 to 15 months old, at least in the United States.

In some other countries, the first dose is routinely given as early as 8 to 9-months of age.

And in high-risk situations, the MMR can safely be given to infants as early as age 6-months.

Is the MMR Safe for 6 Month Old Babies?

An early MMR, is that safe?

This type of pure anti-vaccine propaganda is what caused the measles outbreaks in New York in the first place...
This type of pure anti-vaccine propaganda is what caused the measles outbreaks in New York in the first place…

Yes, it is safe.

What about the package insert?

“Local health authorities may recommend measles vaccination of infants between 6 to 12 months of age in outbreak situations. This population may fail to respond to the components of the vaccine. Safety and effectiveness of mumps and rubella vaccine in infants less than 12 months of age have not been established. The younger the infant, the lower the likelihood of seroconversion (see CLINICAL PHARMACOLOGY). Such infants should receive a second dose of M-M-R II between 12 to 15 months of age followed by revaccination at elementary school entry.”

MMR II Package Insert

The package insert says to give infants who get an early dose another dose when they are 12 to 15 months old! It doesn’t say to not protect these babies!

But what about the idea that the safety and effectiveness of MMR hasn’t been proven for infants under 12 months of age?

In general, the package insert is only going to list studies that the manufacturer used to get FDA approval for their vaccine. Since it is an off-label recommendation of the ACIP, they would not include the studies that show that an early MMR is safe and effective.

“In conclusion, this study indicated that the MMR was well tolerated and immunogenic against measles, mumps and rubella with schedule of first dose both at 8 months and 12 months age. Our findings strongly supported that two doses of MMR can be introduced by replacing the first dose of MR in current EPI with MMR at 8 months age and the second dose at 18 months in China.”

He et al on Similar immunogenicity of measles-mumps-rubella (MMR) vaccine administrated at 8 months versus 12 months age in children.

Before 8 months, an early MMR isn’t likely to be as effective as giving it later. That’s because some maternal antibodies might linger in a baby’s system and can interfere with the vaccine working, even after six months. How many antibodies and how much interference?

It’s almost impossible to tell for any one child, but the risk that this maternal protection has begun to wear off and these infants are at risk to develop measles is too great. That’s the reason that they get an early MMR, even though we know it won’t be as effective as a dose given later and we know it will have to be repeated.

Is this early dose safe?

“This review did not identify any major safety concerns. These findings may facilitate discussions about the risks and benefits of vaccinating infants who are potentially exposed to this life-threatening disease.”

Woo et al on Adverse Events After MMR or MMRV Vaccine in Infants Under Nine Months Old

Of course! Although the complications of measles can be serious, even deadly, we aren’t going to recommend something that is even worse.

“Early MMR vaccination is well tolerated, with the lowest AE frequencies found in infants aged 6-8 months. It is a safe intervention for protecting young infants against measles.”

van der Maas et al on Tolerability of Early Measles-Mumps-Rubella Vaccination in Infants Aged 6-14 Months During a Measles Outbreak in The Netherlands in 2013-2014.

So an early MMR is safe, with few risks, and is likely effective at preventing measles.

And by now you know what’s not safe. That’s right, getting measles.

More on Early MMR Vaccines

Is the La Leche League Anti-Vaccine?

Why would anyone think that the La Leche League, an organization who’s mission is to support breastfeeding, might be against vaccines?

“Many parents have questions about the compatibility of vaccines and breastfeeding. Your healthcare provider can address any questions that come up for you.”

la leche league international on Vaccines

They certainly don’t make any strong statements supporting vaccines…

“The LLLI Health Advisory Council suggests families discuss the pros and cons of influenza vaccines with their health care practitioners.”

la leche league international on Influenza

The cons of influenza vaccines?

What are those exactly? That the protection babies get from their mother’s pregnancy flu shot doesn’t last until they go to college?

What’s the greatest evidence that they might not support vaccines? I mean, besides anti-vaccine La Leache League leaders who actively say that they are against vaccines?

Bob Sears is giving two lectures  on vaccines at an upcoming La Leche League breastfeeding conference.
What exactly will Bob Sears be talking about during his two lectures on vaccines at this upcoming La Leche League breastfeeding conference?

Bob Sears is giving two lectures on vaccines at an upcoming La Leche League breastfeeding conference.

Will he really discuss the benefits of vaccines for pregnant and post-partum mothers and their families?

“Dr. Bob Sears, a renowned Dana Point pediatrician who has been sought out by parents who wish to opt out of the state’s mandatory vaccine requirements, has been placed on probation for 35 months by the Medical Board of California.”

Dr. Bob Sears, renowned vaccine skeptic, placed on probation for exempting child from all vaccinations

And considering that he nearly lost his medical license over giving an improper vaccine exemption, what can we really expect from his talk on California’s vaccine law?

“Remember that La Leche League is exclusively focused on breastfeeding support and has no stance on vaccinations.”

La Leche League USA

No stance on vaccinations?

Actually, with bringing Dr. Bob to their conference, it seems like they made a very clear stance…

“Nursing also allows your baby to give germs to you so that your immune system can respond and can synthesize antibodies! This means that if your baby has come in contact with something which you have not, (s)he will pass these germs to you at the next nursing; during that feeding, your body will start to manufacture antibodies for that particular germ. By the time the next feeding arrives, your entire immune system will be working to provide immunities for you and your baby. If you are exposed to any bacteria or viruses, your body will be making antibodies against them and these will be in your milk.”

Can Breastfeeding Prevent Illnesses?

And they have also done a good job of making it sound like breastfeeding infants don’t need vaccines.

They do!

While breastfeeding is great, it is not a substitute for getting vaccinated. In fact, antibodies in breast milk will not protect a baby against most vaccine-preventable diseases.

If the La Leche League truly wants to support what’s best for kids, they should move away from pushing non-evidence based therapies, especially craniosacral therapy and referrals to chiropractors for breastfeeding problems, and they should take a stand supporting vaccines.

The La Leche League is on this list of other organizations that speak out against vaccines.
The La Leche League is on this list of other organizations that speak out against vaccines.

Then maybe they wouldn’t appear on any lists from the NVIC.

More on Vaccines and the La Leche League

Myths About Your Baby’s Immature Immune System

Newborns and infants have immature immune systems, at least as compared to older children and adults.

Premature babies can usually get all vaccines on schedule - at their chronological age, not an adjusted age based on being a preemie.
Premature babies can usually get all vaccines on schedule – at their chronological age, not an adjusted age based on being a preemie. Photo by Vincent Iannelli, MD

That doesn’t mean that their immune system is so immature they they can’t fight off many infections or that they shouldn’t be vaccinated. Even premature babies should usually be vaccinated on time.

Your Baby’s Immature Immune System

So just how immature is their immune system?

“A picture emerges of a child born with an immature, innate and adaptive immune system, which matures and acquires memory as he or she grows.”

Simon et al on Evolution of the immune system in humans from infancy to old age

It is immature enough that the protection that they get from passive immunity and transplacental transfer of antibodies before they are born is considered critical to protect them from many infections.

“After birth, the sudden enormous exposure to environmental antigens, many of them derived from intestinal commensal bacteria, calls for a rapid change to make distinct immune responses appropriate for early life.”

Simon et al on Evolution of the immune system in humans from infancy to old age

Fortunately, their immune system quickly matures and develops, so that as their maternal protection begins to fade, they are “better armed with the maturing innate and adaptive immune systems.”

“The risks are now much reduced by vaccinations, which stimulate protective immune responses in the maturing immune system.”

Simon et al on Evolution of the immune system in humans from infancy to old age

Getting fully vaccinated  on time helps too.

Myths About Your Baby’s Immune Response to Vaccines

Getting vaccinated?

With an immature immune system?

How does that work?

It will likely come as a surprise to some folks, but it actually works quite well!

“Although infants can generate all functional T-cells (ie, Th1, Th2, and cytotoxic T-cells), infant B-cell responses are deficient when compared with older children and adults. Infants respond well to antigens (such as proteins) that require T-cell help for development. However, until about 2 years of age, the B-cell response to T-cell-independent antigens (such as polysaccharides) is considerably less than that found in adults.”

Offit et al on Addressing Parents’ Concerns: Do Multiple Vaccines Overwhelm or Weaken the Infant’s Immune System?

In fact, we know that:

  • newborns respond well to the birth dose of the hepatitis B vaccine
  • the birth dose of BCG vaccine is effective at preventing severe TB disease
  • infants respond well to the vaccines in the primary series that they get at 2, 4, and 6 months
  • while infants respond well to most vaccines, to “circumvent the infant’s inability to mount T-cell-independent B-cell responses,” we use some conjugate vaccines when necessary, like Hib and Prevnar. This is especially important because their immature immune system puts them at extra risk for Hib and pneumococcal disease. Why? These are “bacteria that are coated with polysaccharides.”
  • older infants and toddlers respond to other vaccines, including MMR and the chicken pox vaccine, once maternal antibodies began to fade and can no longer cause interference.

So vaccines work in babies and young infants, just like they do for older children, teens, and adults.

But that makes you wonder, if anti-vaccine folks don’t think that vaccines work in these younger children and that their immune system is so immature, then how can these vaccines overstimulate their immune system???

They don’t.

Both the immunogencity and safety of vaccines for infants are well studied.

What to Know About Your Baby’s Immature Immune System

Vaccines work well to help protect newborns and infants as their immune system continues to develop and mature.

More About Your Baby’s Immature Immune System