What color night light is best for a baby's sleep?

Warm amber or red light is the consensus pick across parenting communities. Reddit threads in r/ScienceBasedParenting and r/moderatelygranolamoms repeatedly note that red and warm-white settings let parents see for feeds without fully waking the baby, while cooler blue-white light is more disruptive. Babylist's nursery write-up similarly praises the Hatch's soft red, pink, and amber tones for late-night use.