Just reading Meredith Small’s Our Babies, Ourselves. She’s an anthropologist and began her career studying chimps. She has a solid view of humans as primates [she points out that chimps are more closely related to us than they are to gorillas]. So her view of baby-raising is shaped by biological needs, not just custom, and she comes out pretty strongly for sleeping with infants.
She makes several persuasive arguments.
-all primates sleep with their infants.
-humans have slept with their infants for millenia.
-there is zero evidence of babies dying sleeping with their parents.
-babies breathing is strengthened when in close contact with their moms at night.
So if you are inclined, do sleep with your little ones.