Most of the smart audio in the market is based on bass, and the low-frequency sound pressure is large, which will affect the children's auditory system for a long time.

I recommend a Bluetooth audio cd player for infants and pregnant women-witch's single life. This cd player abandons some ultra-low frequencies with excessive sound pressure and highlights soft intermediate frequencies, which is suitable for playing soft and comfortable music, so it is very suitable for infants and pregnant women. In addition, many early childhood music and teaching materials are in the form of CDs, so it is more appropriate to listen to CDs with a special CD player.