Vaiko imuninės sistemos vystymasis prasideda antrą nėštumo mėnesį ir 6-7 metais pasiekia tokį lygį, kurį turi suaugusieji. Sirgti uminėmis kvėpavimo organu ligomis priešmokyklinukui 7-10 kartų per metus yra normalu, nes…
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