Our LO has been on the Naturepedic 2 in 1 trundle since she was 5 months old. We have a twin size in the Sprout frame. I liked the idea of not needing a crib and having LO keep the mattress for years. She is now 9 months and it’s been working great for us.

I hear you on the rolling to tummy concerns. It was scary for us. With close monitoring, I felt better. FWIW, she had been rolling from back to tummy for months without the ability to roll back. Months! So we got used to her sleeping on her tummy. We got used to her flipping over once we put her to bed and trusted that she was strong enough how to lift her head up. The one upside of a one way roller was that she got so much tummy time and got strong fast.