Here is an air purifier designed to grow with your own child. The PureZone Kids Bear Air True HEPA Air Purifier can cover up to 108 sq.ft of space. It gets rid of 99.97% of dust, pollen, smoke, and odors with its 4-stage filtration system. It also comes with a child safety lock.
This air purifier has an optional night light with 7 effects. It has an auto timer and sleep mode. You can find out more about it here.