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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

To not want baby near unvaccinated toddler?

258 replies

victoriaspomge · 09/02/2026 21:53

So basically my partner wants his half brother's (same dad) younger half brother (same mum) to come and meet our baby.
He has a daughter who is 2 years old who he says is our kids cousin.

My partner is no relation to him or his daughter biologically but because they share a half brother he feels as if it's his brother as well and that they are family.

He dosent really know him and doesn't have his number and has only met him in the last 10 years.

They only hang out if it's with their mutual half brother.

I know the 'brother' is very anti vax and has not got his 2 year old vaccinated despite living in a city where it has had a lot of cases of measles.

Baby is too young to be have the MMR and I am extremely worried about my baby meeting this 2 year old.

AIBU to feel like this?

BoredZelda · 10/02/2026 14:07

StandingSideBySide · 10/02/2026 13:52

Whilst I agree OP is not being unreasonable
I also agree
vaccinations in the U.K. are not mandatory and having a child vaccinated does not give them complete immunity
approximately 3% of vaccinated children can contract and pass on measles

I do wonder how people cope when their kids go to nursery with many starting before 12months so unvaccinated and more before 18months when the second mmr dose is due.

Nurseries generally have babies and toddlers separated so this isn’t much of an issue. Nursery is also a necessity so you weigh up risks. That doesn’t mean you allow a free for all, all the time.

ContentedAlpaca · 10/02/2026 14:09

victoriaspomge · 10/02/2026 14:05

A a lot of OH's friends are anti vaxxers and a few have kids who are aged 1 - 2.

OH likes to talk about vaccines to them to get their input and at least 3 (including the brother) have chosen not to have theirs vaccinated.

It a concern as they live in Birmingham where there is a quite a few measles cases going round.

My baby does go out daily, parks, shops, days out etc but with the UK losing its measles elimination certificate it just got me worried when OH mentioned about his friends unvaccinated kids and them wanting their kids to meet the baby.

It was eliminated briefly between 2017 and 2018, then again briefly in 2021 due to the pandemic.

StandingSideBySide · 10/02/2026 14:17

BoredZelda · 10/02/2026 14:07

Nurseries generally have babies and toddlers separated so this isn’t much of an issue. Nursery is also a necessity so you weigh up risks. That doesn’t mean you allow a free for all, all the time.

Ours didn't all the time
There was a room for babies but at meal times, parties and in the gardens they were all together
The same goes for a nursery a friend runs

Plus of course there are those kids who aren’t vaccinated at the 12 and 18 month point in the same space as those that might be just a few months younger but not old enough for the vaccine.
Let’s also not forget older unvaccinated siblings of babies

Thechaseison71 · 10/02/2026 14:19

ContentedAlpaca · 10/02/2026 13:42

Yes but whooping cough immunity from the vaccine wanes quite quickly.
They didn't offer it in pregnancy when I had my children so I haven't been offered it since I was six and had my last set of boosters.

How quickly? Surely if that's the case most people are unprotected?

BoredZelda · 10/02/2026 14:19

Thechaseison71 · 10/02/2026 11:13

What if it had been your own toddler who COULDNT have the vaccine? What do you do? Bung them into care for a year until the baby was vaccinated?

If I had a child who couldn’t be vaccinated, I’d have taken each situation on a risk by risk basis. Many nurseries insist on vaccination, except where a child can’t be vaccinated. I’d probably look in to that. I’d also take advice from the GP. I can’t imagine how difficult it must be to have a child you can’t protect. That’s why if find it difficult to understand why people choose not to.

Thechaseison71 · 10/02/2026 14:20

BoredZelda · 10/02/2026 14:07

Nurseries generally have babies and toddlers separated so this isn’t much of an issue. Nursery is also a necessity so you weigh up risks. That doesn’t mean you allow a free for all, all the time.

The baby room in DS nursery was 0-2 years. Thought that was pretty commonplace

Thechaseison71 · 10/02/2026 14:22

Mumtobabyhavoc · 10/02/2026 14:06

Because that's exactly what we were told and initial vaccinations were more effective on earlier strains. Now it's about 45% effective against infection and 57% effective preventing serious disease. Masking when ill/any symptoms and avoiding others should still be practised. Still important to get the vaccine.
Some vaccines are more effective than others based on the nature of the virus. In the case of measles the vaccine is 97% effective.

Why is it important to get the COVID vaccine for most people

BoredZelda · 10/02/2026 14:22

StandingSideBySide · 10/02/2026 14:17

Ours didn't all the time
There was a room for babies but at meal times, parties and in the gardens they were all together
The same goes for a nursery a friend runs

Plus of course there are those kids who aren’t vaccinated at the 12 and 18 month point in the same space as those that might be just a few months younger but not old enough for the vaccine.
Let’s also not forget older unvaccinated siblings of babies

Edited

generally

Most do so because of staffing requirements. You aren’t going to have a bunch of toddlers who could be looked after by fewer staff, in a room where the staffing ratio is 1:3.

StandingSideBySide · 10/02/2026 14:23

BoredZelda · 10/02/2026 14:19

If I had a child who couldn’t be vaccinated, I’d have taken each situation on a risk by risk basis. Many nurseries insist on vaccination, except where a child can’t be vaccinated. I’d probably look in to that. I’d also take advice from the GP. I can’t imagine how difficult it must be to have a child you can’t protect. That’s why if find it difficult to understand why people choose not to.

Nurseries in the U.K. cannot legally insist on vaccinations

Thechaseison71 · 10/02/2026 14:23

BoredZelda · 10/02/2026 14:19

If I had a child who couldn’t be vaccinated, I’d have taken each situation on a risk by risk basis. Many nurseries insist on vaccination, except where a child can’t be vaccinated. I’d probably look in to that. I’d also take advice from the GP. I can’t imagine how difficult it must be to have a child you can’t protect. That’s why if find it difficult to understand why people choose not to.

You said in NO world would you let your baby near an unvaccinated toddler.

ContentedAlpaca · 10/02/2026 14:23

Thechaseison71 · 10/02/2026 14:19

How quickly? Surely if that's the case most people are unprotected?

It wanes around 10% per year.

www.cdc.gov/pertussis/hcp/vaccine-recommendations/index.html#:~:text=Immunity%20to%20pertussis%20following%20Tdap,protection%20against%20tetanus%20and%20diphtheria.

StandingSideBySide · 10/02/2026 14:26

BoredZelda · 10/02/2026 14:22

generally

Most do so because of staffing requirements. You aren’t going to have a bunch of toddlers who could be looked after by fewer staff, in a room where the staffing ratio is 1:3.

I agree but
Like I said at meal times etc it’s not the case

In terms of babies theoretically protected by being in a seperate environment for most of the time this is only relevant if they don’t have older siblings or all older siblings are vaccinated.

Mumtobabyhavoc · 10/02/2026 14:30

Thechaseison71 · 10/02/2026 14:19

How quickly? Surely if that's the case most people are unprotected?

Adults are recommended to get TDAP every 10 years. I caught pertussis when travelling and it was awful (I didn't know I had it, just though very sick with bronchitis). Managed to get to a doctor and get antibiotics. The cough was horrifying - I literally though I would die as I couldn't get air in/out mid coughing fit.
After I got home and recovered I got updated vaccinations for everything. I've done it a couple of times, not including pregnancy vaccinations.

Thechaseison71 · 10/02/2026 14:31

BoredZelda · 10/02/2026 14:22

generally

Most do so because of staffing requirements. You aren’t going to have a bunch of toddlers who could be looked after by fewer staff, in a room where the staffing ratio is 1:3.

It was 1:3 ratio in the baby room up to 2 years at DS nursery so not getting point of your posts. And some of those kids are old enough to have vaccines and some arent

Also not all the kids were full time so a bigger amount of kids DS went 4 days, some 2 days so other kids made up the other 3 days etc

ContentedAlpaca · 10/02/2026 14:32

I found this really interesting. I hope grandma gets her booster to protect baby!

  • All babies less than six months old are at risk of catching whooping cough because they have not completed the three-dose primary vaccine course. This risk period is longer if the six-month vaccines are not given on time.
  • Protection against whooping cough can last for up to 10 years after a booster dose but starts to wane after 4-5 years.
  • A booster dose of adult whooping cough vaccine is recommended for all parents of newborns. Grandparents and other carers in contact with children who are less than six months old should also have an adult pertussis booster, even if they have been infected with whooping cough in the past.
  • Every adult is susceptible to whooping cough infection unless they have had a recent pertussis booster. Adults are the ones most likely to spread infection to babies under six months who are not yet fully vaccinated.
Thechaseison71 · 10/02/2026 14:34

ContentedAlpaca · 10/02/2026 14:32

I found this really interesting. I hope grandma gets her booster to protect baby!

  • All babies less than six months old are at risk of catching whooping cough because they have not completed the three-dose primary vaccine course. This risk period is longer if the six-month vaccines are not given on time.
  • Protection against whooping cough can last for up to 10 years after a booster dose but starts to wane after 4-5 years.
  • A booster dose of adult whooping cough vaccine is recommended for all parents of newborns. Grandparents and other carers in contact with children who are less than six months old should also have an adult pertussis booster, even if they have been infected with whooping cough in the past.
  • Every adult is susceptible to whooping cough infection unless they have had a recent pertussis booster. Adults are the ones most likely to spread infection to babies under six months who are not yet fully vaccinated.

So does that mean the vaccine they give mums during pregnancy is pointless then? Thought that was to protect the babies until they had the vaccines themselves

The father's of the 2 babies I know ( both under 14 months) were never offered boosters

ContentedAlpaca · 10/02/2026 14:38

Thechaseison71 · 10/02/2026 14:34

So does that mean the vaccine they give mums during pregnancy is pointless then? Thought that was to protect the babies until they had the vaccines themselves

The father's of the 2 babies I know ( both under 14 months) were never offered boosters

Edited

I guess it must offer some, but not complete protection if they are advising it? Presumably from antibodies passed from the mother.

Mumtobabyhavoc · 10/02/2026 14:38

Thechaseison71 · 10/02/2026 14:34

So does that mean the vaccine they give mums during pregnancy is pointless then? Thought that was to protect the babies until they had the vaccines themselves

The father's of the 2 babies I know ( both under 14 months) were never offered boosters

Edited

Vaccination while pregnant passes antibodies on to baby but protection is short term until baby can receive its own vaccinations.

StandingSideBySide · 10/02/2026 14:42

Thechaseison71 · 10/02/2026 14:34

So does that mean the vaccine they give mums during pregnancy is pointless then? Thought that was to protect the babies until they had the vaccines themselves

The father's of the 2 babies I know ( both under 14 months) were never offered boosters

Edited

We weren’t recommended or offered anything regarding adult vaccines
Not even dh or I. Is this a recent thing ?

@ContentedAlpaca

over50andfab · 10/02/2026 14:44

Thechaseison71 · 10/02/2026 13:02

Measles isn't always avoidable though. I didn't avoid it

Sorry to hear that. 2 doses are 95% effective against measles, however no vaccine is 100%

ContentedAlpaca · 10/02/2026 14:49

StandingSideBySide · 10/02/2026 14:42

We weren’t recommended or offered anything regarding adult vaccines
Not even dh or I. Is this a recent thing ?

@ContentedAlpaca

Edited

The bullet points were from here.
https://www.rch.org.au/kidsinfo/fact_sheets/whooping_cough/

I was looking for information about how long immunity from pertussis vaccine lasts. (4-10 years), so there are probably lots of unprotected adults around.

However, to complicate things, immunity from infection is more long lasting (7-20 years)
So many of these adults whose vaccine immunity waned long ago may have had since had an infection, mild or otherwise, that has left them with immunity
https://pmc.ncbi.nlm.nih.gov/articles/PMC5404361/

Kids Health Info : Whooping cough

https://www.rch.org.au/kidsinfo/fact_sheets/whooping_cough/

over50andfab · 10/02/2026 14:58

Re Pertussis, I couldn't find UK data for last/this year (maybe someone else can for all of last year) but came across this which makes for sad reading https://pharmaceutical-journal.com/article/news/whooping-cough-cases-increase-by-1600-in-a-year-data-show

ContentedAlpaca · 10/02/2026 15:01

over50andfab · 10/02/2026 14:58

Re Pertussis, I couldn't find UK data for last/this year (maybe someone else can for all of last year) but came across this which makes for sad reading https://pharmaceutical-journal.com/article/news/whooping-cough-cases-increase-by-1600-in-a-year-data-show

I can't read the rest without registering but now there should be a lot more immunity. Illnesses will go in cycles.
Adults generally don't get the characteristic whoop it's more likely to go undiagnosed.

SinnerBoy · 10/02/2026 15:25

TaraC25 · Today 13:28

Well of course loosing a child at any age is sad. Children still die now, despite vaccines.

In vastly fewer numbers, of course, because many common diseases have effectively been eradicated - by vaccinations. When did you last see a charity box for the deaf, dumb and blind? (A not unusual complication of measles). How about polio kids with calipers, or on breathing devices?

So your argument is that all children should receive a vaccine now, because 250 years ago some children died from something else?

They were dying of the same diseases we vaccinate for now.