The Silent Night Bedside Crib/Cot Mattress (83cm x 48cm x 1 inch) seems well-suited for a bedside co-sleeper. Its compact size fits perfectly for co-sleeping setups, and the firmness could provide adequate support for the baby. However, the 1-inch thickness may feel a bit thin for some, especially for longer use, but it could still be a good option if you’re looking for a simple and easy-to-clean mattress for short-term or travel use.