Some babies, especially premature babies or those who have been in Special Care Nursery really benefit from a low stimulus environment. They need periods of quiet and rest to let their brains re organize and relax. You can also cluster their care needs, so you can change, feed and clean them all at once and then let them rest rather than disturbing them all the time. Babies are extremely sensitive to environmental stimulus like noise, light, smells and rough handling. Be incredibly careful and gentle in handling a new- born baby.
Babies like white noise or soothing background noise like wave music or rain music. The volume should be low-like the sound of a shower. They are used to the sounds of your tummy and blood flow through the umbilical cord making a whoosh sound. It blocks out other background noise and helps them to sleep longer.
Background noise for babies: https://apps.apple.com/us/app/white-noise-deep-sleep-sounds/id1083248251
It may sound obvious but place the baby in a quiet room. They need a quiet, dark area to sleep in where the noise and stimulation of people, siblings, TV and radio are reduced. My pet hate is when baby’s bassinet is placed in front of the huge TV.