I googled "blue hands and feet in children" and I found this question and answer.
Google the same and you will find a lot of information that will answer more of your questions.
I feel as a mom that if we are concerned, then BE CONCERNED and dont EVER feel bad about it!
Hope this helps...
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You are here: Experts > Kids > Health for Kids > Pediatrics > infant of 5 mos. blue feet and hands
Topic: Pediatrics
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Expert: Lars Erickson, MD MPH
Date: 6/15/2004
Subject: infant of 5 mos. blue feet and hands
Question
My grandson has had episodes where his feet and hands become blue and cold to the touch. He is in daycare and has had a bronchial cough for several weeks. His doctor seems unconcerned. I'd like to know a little about any disease process which could cause this symptom.
Thank you
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Answer
Blueness of the skin (cyanosis) can be a sign of low oxygen in the blood, which in turn can be a sign of problems with breathing, the heart or the blood. On the other hand, it is, in fact, very common for normal children (especially young children) to have periods during which their hands, feet and the area around their mouth, eyes and the bridge of their nose turns dusky blue. While older children become blue in the hands and lips when they are cold or ill, often younger children may go blue in these areas when they are quite warm and for no apparent reason. This is thought to be caused by immaturity of the part of their nervous system that controls temperature in babies, but can also occur in older children as well. The medical term is "vasomotor instability", which is a rather frightening name for a normal and harmless finding. This sort of blueness is also common during the rising phase of a fever. During these episodes the oxygen level in the blood is normal, and there should be no signs of difficulty breathing, dizziness or fainting. In addition, the child should not be blue over the entire body - the color change is generally limited to the extremities and around the mid-face.
If there is any question whether a child with cyanosis is having any sort of medical problem, the usual steps are to have a careful medical examination with measurement of the oxygen level during an episode. If the exam and oxygen level are normal, there is rarely cause for concern.
I hope this is helpful.