Carpets need to be checked once a month. The changing table needs water nearby, a supply of wipes and extra diapers. Cabinets need locks. Electrical plugs need shields. Broken toys and furniture need to be repaired.
Paint needs to be lead-free.
Furniture needs to be sturdy enough for a child to pull up without toppling it. Doors need child-proof knobs. Outside playground gates need sturdy fasteners too high for children to reach and sufficient padding beneath climbing toys and swings. In other words, a nursery needs the same regard for child safety as any careful home. This is essential.