To not want baby near unvaccinated toddler?

Tbh I only knew it was whooping cough because I was old enough to remember the public information advert of the seventies/ eighties largely because my youngest sister was hospitalised with whooping cough as a baby herself. GP didn't believe it was whooping cough because there were no recorded cases in the area at that time. There were likely no recorded cases because of a reluctance to swab.

That sounds like an incredibly difficult time.
Whooping cough is an interesting one. Vaccine induced immunity wanes very quickly - from around 4 years post vaccine. Most of the adult population will not be covered by vaccine induced immunity but may have immunity from catching the infection. Natural immunity is longer lasting.
It is under diagnosed as adults don't tend to get the 'whoop' and from your experience, it sounds like it is also under diagnosed because of a reluctance to swab for it.
It calls into question how seriously health professionals take it.

Well they had no symptoms either so very unlikely to have been them. GP asked if siblings were unwell so as to give antibiotics to them as well but they were fine. I imagine baby caught it on the school and nursery run or at parents’ assembly.

Your older children could still have passed it to the baby? Being vaccinated doesn't mean it absolutely wasn't them.

As someone whose newborn baby caught whooping cough (pre maternal vaccination) I would say YANBU. I never discovered who passed it to ds largely because our GP didn't recognise ds had whooping cough. I had to demand he was swabbed so it was highly likely that if another child was taken there they wouldn't have been swabbed either. My older ones had been vaccinated and didn't pick it up from the baby but it was a hugely difficult time soon after birth.

his half brother's (same dad) younger half brother (same mum)

You lost me here. Is this some sort of sex commune with all these loosely related people?

The advice I got when my kid was exposed to measles before she received the MMR ( she was too young before anyone asks) was that the reason they delay MMR to 13 months is because the infant retains the mother's immunity until that time and the immunisation needs a system to be "clear" of measles in order for the immune response to generate. So it would depend on the age of the child. Breastfeeding also has huge protections too.

It's still far, far rarer than unvaccinated children getting measles! Well over 90% of measles cases today are in unvaccinated children. I think I'll take those odds.

1-3% is not very very rare. 0.006 of something like that would be very very rare

You can indeed still get those illnesses but it is very, very rare. Far rarer than a vaccinated child/adult getting them.

Or let's put it another way. I assume you use a seatbelt/child seat when driving a car. Presumably you don't usually expect to get in an accident - so do you use them anyway because we manage the risks we can or you don't use them because you think they're unlikely to be needed as you probably won't have an accident?

Risk is inherent in everything we do, it's a part of everyday life. Vaccination, just like seatbelts and child seats is all about managing those risks.

Of course not. There is a difference between taking a chance in the wider world (in which the majority of people are vaccinated) and knowingly exposing yourself to the risk of an unvaccinated child, who could be carrying potentially deadly virus without presenting with symptoms. If you can't differentiate between those two levels of risk, I doubt anything anyone says here will help you.

It does make a difference getting vaccinated against measles in that that the vast majority of people who've had it will have immunity.
Given that vaccine hesitancy and misinformation is becoming more and more a challenge I remember reading that it was one of the top 10 threats to Global Health a few years ago) we all decide on the level of risk we take in anything we do, and anything that in this case a mother might not want to potentially expose her baby to.

I'm not fluent in emoji, would you mind explaining? You don't have kids but your oldest got it? Makes no sense

I'm curious about measles vaccine immunity now and whether adults should be considering boosters.

https://www.thelancet.com/journals/lanpub/article/PIIS2468-2667(24)00181-6/fulltext

"Among people infected with measles in England between 2010 and 2019, the proportion of cases who had previously received two doses of vaccine has increased, especially among young adults. Possible explanations include rare infections in vaccinated individuals who did not gain immunity upon vaccination, made more common because fewer individuals in the population were born in the endemic era, before vaccination was introduced, and exposed as part of endemic transmission, or the waning of vaccine-induced immunity, which would present new challenges for measles control in near-elimination settings. We aimed to evaluate whether measles dynamics observed in England between 2010 and 2019 were in line with a waning of vaccine-induced immunity."

Also

https://pmc.ncbi.nlm.nih.gov/articles/PMC8189124/

Everyone will be different but it seems that immunity induced by that particular vaccine wanes quite quickly over time. Immunity from contracting the virus seems to last longer according to the literature but isn't lifelong. (7-20 years vs 5-10 years according to one study I found).
It's likely to be much more prevalent than we know and particularly under diagnosed in adults as we tend not to get the characteristic "whoop".

Errrr you can also still get measles and whooping cough after having the vaccine as others in this thread have said and also I know this from experience so it makes no difference at all. You could get his by a comet too .. but we all live our lives!

So if the jab lasts 5 years then every 6 year old onwards doesn't have the protection?

Anyone who hasn't received a whooping cough vaccine in the last 5 years is a potential whooping cough spreader. Whooping cough has around a 3 week window where it is contagious vs 8 days with measles and for some of that 8 days a rash will be present.
This will mean most adults are a whooping cough risk, as only pregnant women tend to be offered boosters as adults.

Ops baby is too young to be vaccinated

Are you asking for all the vaccination records of every adult who visits you too? Literally anyone could be incubating anything at anytime.

Get your kids vaccinated and get a grip!

As i said above, i was really ill year following measles with chronic tondillitis. My sister and i werent allowed to have measles vaccine when it was introduced because my sister was still having febrile convulsions ( abnormal genetic fc now known as GEFS+)

That's interesting. I had whooping cough within a year after having measles but it's never occurred to me that there could be a link. It wasn't a fun time.

I was vaccinated

Er, actually sometimes they are. A child with measles/whooping cough etc., either in the incubation period or with the active virus, is quite literally a posionous monster around an unvaccinated baby. Just because you can't see the virus doesn't mean they don't have it.