This is absolutely worth taking seriously. Safe sleep practices in nurseries are critical - babies should be placed on their backs, on a firm flat surface, without pillows, bumpers, or loose blankets. If there's been a recent incident that's raised concerns, that's a legitimate wake-up call for parents to verify their own childcare settings aren't cutting corners. Most reputable nurseries follow guidelines pretty closely, but not all, and complacency can creep in.
Here's what I'd do: request a meeting with the nursery manager and ask them directly about their sleep policies. Don't be apologetic about it - you're entitled to know exactly what happens during nap times. Ask whether they follow current safe sleep guidance, how many staff supervise sleeping children, what monitoring systems they use (some have cameras you can access), and whether staff get regular training on safe sleep practices. A good nursery will welcome these questions and have clear answers ready. If they're vague, defensive, or can't explain their procedures, that's a red flag worth taking seriously.
Also look at their Ofsted ratings if you're in England - these inspections do cover safeguarding and childcare standards. But the rating alone isn't everything; a recent report matters more than an older one. Talk to other parents too if you can, both current and former ones. What matters most is that your nursery can demonstrate they're actively following best practices and that someone's actually watching the children while they sleep. Trust your gut - if something feels off about how they handle your questions, that's worth exploring further.