This is Dr. David
the blue tinge around the mouth is most likely not due to a heart issue.
it is most likely due to veins just under the skin causing the blue color
that is good your child has good oxygen levels in the blood and is in good health, good appetite and lots of energy.
sometimes veins just under the skin can cause an area like the lips to look blue or have a blue tinge.
you can upload a clear jpg photo of his lips, I would be happy to look at it.
but it doesn't sound like it is a sign of problems or heart problems.
let me know if you have other questions.
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that is good he is sleeping.
I would not stress about the blue color
you can send a photo if you would like
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veins can swell and contract under the skin and cause more or less blue tinge.
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