Cov khoom siv hauv chaw ua si yog qhov tsim nyog rau txhua yam chaw zov menyuam.

Cov khoom siv chaw ua si zoo yog qhov tseem ceeb rau kev xaj khoom lag luam thiab kev lag luam mus sij hawm ntev muaj txiaj ntsig.

Nov yog peb cov ntsiab lus kev ua si tom hav zoov rau cov menyuam hnub nyoog 2-5 xyoos.

Peb tus nqi ntawm cov khoom siv hauv chaw ua si yog tus nqi pheej yig thiab muaj txiaj ntsig zoo.Tag nrho cov khoom siv hauv chaw ua si lub sijhawm lav yog 5 hnub rau 1 teeb qauv coj mus kuaj, 10 hnub rau 2-5 teev.