A system for safely containing an infant on a mattress is described. The system includes a base that supports the mattress and panels that extend upwardly from the base and together form an enclosure around the mattress. A porthole is defined through at least one of the panels, where the porthole provides access into the enclosure. A porthole door has locked and unlocked positions and covers the porthole only in the locked position. A detection system detects when the porthole door is in the unlocked position. A lighting system is operatively coupled to the detection system and is configured to emit light when the porthole door is detected to be in the unlocked position. A power system provides energy to the lighting system for emitting the light.