Levoit 2.5L Top-Fill Humidifier
Fills from the top, so you're not carrying a sloshing tank to the sink and back upside down. Runs 25 hours on low at 28 decibels — quieter than a whisper, which matters six feet from a crib.

A 4.2 litre tank running up to 42 hours and covering 432 square feet — the one you buy if the nursery is a converted living room or you'd rather refill twice a week.
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Large rooms, or a whole floor of a small house
A bigger tank is a bigger thing on the floor. Check the corner you'd put it in.
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