Kev hais lus, nkag, taug kev, nyeem ntawv thiab ua haujlwm ntawm cov menyuam yaus yog cov txheej txheem sib txawv ntawm tib neeg lub neej.Tsis muaj leej twg yuav luag nag hmo babbling thiab nkag.Ntawm qhov tsis sib xws, nws yog ib qho kev lom zem thiab zaj dab neeg tsim nyog yuav tsum tau ceev faj tom qab kev noj qab haus huv ntawm peb lub neej.Sim...
Nyeem ntxiv