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Is it slow for a baby to cry after a few seconds of vaccination?
This conclusion is contrary to common sense, and I didn't realize it until I was vaccinated last month. Because as an adult, the pain is worse after pulling out the needle. In turn, it proves that the baby's reaction is natural.
So why wait until the vaccine is finished and the needle is pulled out before it starts to hurt? What happened during vaccination?
When we talk about vaccination, we are actually injecting a drug into the muscle. Doctors use the needle of a syringe to pierce the skin, penetrate the dermis and finally reach the muscle tissue, and then push the vaccine (liquid medicine) into the muscle tissue from the needle tube. Then pull out the needle. The whole process is very fast, and skilled staff can control the whole process in a few seconds.
The syringe used is a 1 ml syringe with a needle diameter of 0.45 mm. This is a very slender needle model, which is thinner than the scalp needle usually used for blood test. The pain degree of acupuncture is related to the thickness of the needle. The thinner the needle, the lighter the pain degree. The feeling caused by pricking a needle for vaccination is similar to the moment of being bitten by a mosquito, and it is lighter than the feeling of venous blood test. Because of the short time, this degree of pain is tolerable for children.
When acupuncture enters the skin, it will physically stimulate the skin receptors, and these receptors will convert the stimulation into signals, which will then be transmitted to the brain through the nervous system, resulting in a feeling of pain. One of the characteristics of skin receptors is that in addition to stimulation, it needs a certain area to wake up the receptor conversion, which is why the thinner the needle, the lighter the feeling. The duration of stimulation is also a factor affecting pain. Because the needle was pulled out in a few seconds, the skin feeling was not so strong that it was unbearable.
That's why children don't show pain immediately when they just put in a needle. Although they felt it, it was not painful.
Then why did it start to hurt after pulling out the needle? This is because drugs reach between muscle fibers, and there are pain receptors in muscle tissue. Unlike receptors in skin, receptors in muscle tissue are slower to respond, but more sensitive to chemical stimuli. When the drug enters the muscle tissue, it will strongly stimulate the chemoreceptor, so that the pain signal will continue to be transmitted to the brain to produce pain. Personally, I feel this kind of pain is similar to the degree that my arm touches the corner when I walk quickly.
Moreover, the pain receptors in muscles have a slow adaptability, that is to say, as long as the stimulation lasts, the degree of pain will not be alleviated. Contrary to skin receptors, skin receptors adapt quickly. If a stimulus does not change for a long time, the receptor will reduce the degree of incoming signals. Personally, I feel that it lasted for about 5 minutes before it began to ease. Because I am vaccinated with the same measles vaccine as the children, I should feel the same as the children.
So the stimulation of drugs on muscle tissue is the reason why children cry. This kind of pain is stronger than skin and lasts for a long time. It takes drugs to push into the muscles to feel it, which is why the child cried later.
Of course, because older children have memories, they may recall the discomfort of previous needles before needles, so they will cry in fear. This is different from a baby's.
So if the baby starts crying after vaccination, don't laugh at the child, it really hurts. You can comfort your baby, give him something delicious or give him a hug and a kiss, which can comfort him. If it is a baby, sucking breast milk or pacifier can make the baby feel better.
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