03/31/2026
Dr. Chheda - ๐ง Around six to eight weeks of life, there is a barrier that forms that protects the entire brain from the rest of the body. This is called the blood-brain barrier. It basically is a filter system that can filter out viruses and bacteria from reaching the brain.
โ ๏ธ Before six to eight weeks of age, the barrier has not formed, and so anything that's in the blood can go to the brain - any bacteria, any virus - and that can cause meningitis within 48 hours. That's why we want babies to stay away from other people for the first six to eight weeks.
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After six to eight weeks, once the barrier is formed, then babies can go out and they can be around other people. Still use common sense - if somebody is coughing and sneezing, don't let them hold your baby.
๐จ If your baby has any symptoms in those first six to eight weeks of life - any fever, any runny nose, anything - we as pediatricians take it very, very seriously because we know that it can be fatal within 48 hours.
To prevent that, just keep your baby indoors. You can take a walk outside, but just not around people. That's what we talk about - the blood-brain barrier.
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