To ensure your Moses basket is safe, make sure it has a firm, entirely flat, and waterproof base, with no soft or cushioned areas, particularly around baby’s head. Soft mattresses are known to increase the risk of SIDS as they make it harder for babies to lose body heat, which can cause them to overheat. The surface of the mattress should be firm enough that when your baby is placed on it, their head does not sink in more than a few millimetres. You can test the firmness of a mattress using the “safe hand test”. To do this, press your hand down on the mattress and when you lift your hand up if your handprint is there the surface is not a safe sleeping surface for a baby or toddler.