Last year before last, California tried to pass a law saying that if babies die of any reason within 30 days of birth, it is illegal to investigate or prosecute. This brought huge outrage, so it didn't pass: https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202120220AB1666 Article summarizing it: https://californiaglobe.com/articles/infanticide-or-pregnancy-loss-abortion-bill-passes-assembly-judiciary-committee/

Last year, California watered the bill down so that if the baby's death was due to mother's negligence and the baby died only within 7 days, then the mother couldn't be prosecuted. This one passed. So yes, infanticide is legal in California as long as it is within 7 days of the baby's birth: https://www.skywatchtv.com/2022/06/12/california-infanticide-bill/

Edit to add: This bill was marketed as a bill to protect abortion rights and most people didn't look into the details. I don't think it would have passed if more people understood the details.

Last year before last, California tried to pass a law saying that if babies die of any reason within 30 days of birth, it is illegal to investigate or prosecute. This brought huge outrage, so it didn't pass: https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202120220AB1666 Article summarizing it: https://californiaglobe.com/articles/infanticide-or-pregnancy-loss-abortion-bill-passes-assembly-judiciary-committee/

Last year, California watered the bill down so that if the baby's death was due to mother's negligence and the baby died only within 7 days, then the mother couldn't be prosecuted. This one passed. So yes, infanticide is legal in California as long as it is within 7 days of the baby's birth: https://www.skywatchtv.com/2022/06/12/california-infanticide-bill/