Why Are White Blood Cells Low?

My child is 12 and a half years old and often lacks energy, feeling like sleeping while sitting, not much talking throughout the day. A routine blood test showed a WBC count of 3.4×10g/L. The doctor said it’s a decrease in white blood cells, which might indicate body inflammation. Is that correct? What should I do? I look forward to your reply, thank you!
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Why Babies Always Stretch Their Lazy Bodies

Babies often stretch their lazy bodies or turn red in the face while twisting their bodies, especially at night when sleeping. They may sigh and sigh, turn red in the face, and stretch their bodies as if they are very tired. This is because of their immature digestive function and irregular bowel movements, which can lead to excessive intestinal gas, gastrointestinal bloating, or even intestinal colic. Most of these are physiological phenomena. As babies grow older, these symptoms usually diminish after three months, and no special treatment is needed.
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Why Babies Are Easily Scared While Burping

A 20-day-old baby may be easily startled during burping and is sensitive to sounds, possibly accompanied by symptoms of alopecia. The parents have already administered vitamin AD drops and calcium carbonate supplements, but they are still worried about a potential calcium deficiency. The doctor advises checking the levels of vitamin D and calcium in the blood, and possibly administering a vitamin D injection. If the test results are normal, it can continue to regularly supplement vitamin AD drops, and additional calcium supplements may not be necessary.
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