Above all new mattress cores can emit a new odour which cannot dissipate completely beforehand due to the packaging. The odour is harmless and will have dissipated at the latest two to four weeks after unpacking the mattress. Ideally, ventilate the mattress outside prior to initial use. However, please ensure that the mattress does not become damp and is not exposed to direct sunlight. All our mattress cores are tested multiple times by independent test institutes for harmful substances and are superbly suited for use in baby beds.