Voice-changing period refers to the period of hoarseness, narrow vocal range, pronunciation fatigue, local congestion and edema, and increased secretion due to the growth of larynx and vocal cords, which leads to different voices when talking and singing from childhood, lasting for six months to one year. Therefore, it is normal that the songs that could have been sung in this period can't be sung now. Don't be too nervous. In the meantime, you need to pay attention to protect your voice and avoid damage to it. There will be some changes in the voice after the voice change, which may not be completely restored, but the tone color will not change generally, so don't worry too much about O (∩ _ ∩) O.