Balcony playing closet on the four-month-old baby with or without harm depends on the material of the closet and formaldehyde and so on, such as the closet formaldehyde content exceeds the standard will have a certain degree of harm to the baby. Balcony playing closet if you can smell the pungent odor, consider more than formaldehyde exceeds the standard, it is recommended that the baby away from the balcony, more ventilation, to prevent the baby from breathing problems, allergic cough and other symptoms, and even lead to leukemia. If you do not smell and irritating odor, according to the closet materials, such as judgment, such as sheet metal, paint and other toxic substances containing formaldehyde or benzene need to ventilate for a few days, but the new closet may be more or less toxic substances, I do not know whether there are hazardous substances or recommend more ventilation for a few days before letting the baby near, can be placed in the closet activated charcoal and other adsorptive effect of the material.