The nursery is the room that deserves the most careful attention of any room in your home. Children spend more time in this room than any other. They breathe more air per unit of body weight than adults. They spend significant time on the floor where dust concentrations are highest. Their organ systems are still developing. The window during which environmental exposures have the most lasting effects on brain development, immune function, and hormonal systems is precisely the window of infancy and early childhood. Getting the nursery right matters more than getting any other room right.
Why the nursery matters
Children are not small adults when it comes to chemical exposure. A toddler breathes approximately twice as much air per kilogram of body weight as an adult, meaning air pollutants have twice the effective dose per unit of body mass. Children spend significantly more time on floors, where dust accumulates toxins that have settled from the air. Hand-to-mouth behaviour means floor contaminants are directly ingested. The developing blood-brain barrier is more permeable, meaning neurotoxins like lead and organophosphates have greater access to developing brain tissue.
The mattress
The mattress is the single most important item in the nursery. Infants sleep 14 to 17 hours a day, their face inches from the mattress surface, breathing whatever off-gasses from it. Conventional foam mattresses use polyurethane foam treated with flame retardants to meet flammability standards. Studies have found brominated and organophosphate flame retardants in crib mattress foam at concentrations sufficient to cause concern. The best certified options are Naturepedic (GOTS-certified organic cotton, no foam, no flame retardants beyond natural wool barrier) and Newton Baby (a breathable mesh construction with no foam at all, reducing off-gassing risk entirely).
Paint and flooring
Paint off-gasses VOCs for weeks to months after application, and infants should not sleep in a freshly painted room. Use zero-VOC or low-VOC paint (most major brands now offer this), and ventilate thoroughly for at least two weeks before the baby occupies the room. For flooring, synthetic carpet is both a VOC source and a reservoir for dust-bound toxins. Hard flooring with a natural wool or organic cotton area rug is preferable. If synthetic carpet is already in place, HEPA vacuum weekly and consider a natural fibre rug on top as a barrier layer between the child and the carpet.
Furniture
New MDF and particleboard furniture off-gases formaldehyde for months to years. For nursery furniture, choose solid wood wherever possible, or furniture explicitly certified to GREENGUARD Gold standards, which have stricter emissions limits than standard. The IKEA Sundvik crib, for example, is sold as GREENGUARD Gold certified. Assemble new furniture well before the baby uses the room and ventilate aggressively during the initial off-gassing period. Avoid MDF or chipboard bookshelves, changing tables with MDF components, and flat-pack items in the main sleep and play areas.
Toys and textiles
PVC soft toys contain phthalates. Avoid soft vinyl bath toys (they also harbour internal mould). Safe materials for baby toys include natural rubber (Hevea makes excellent teethers), solid wood with water-based paint (Bannor Toys), and organic cotton stuffed toys. For bedding and clothing that contacts skin, choose GOTS-certified organic cotton. Conventional cotton is among the most pesticide-intensive crops globally and residues persist in processed fabric. For sippy cups and bottles, stainless steel (Klean Kanteen Kids) and glass with silicone sleeves are the non-leaching options.