
Children’s sleepwear has been the subject of  controversy since the 1970s.  The original rules for baby pajamas were adopted by the Department of  Commerce in 1971 and the enforcement was subsequently transferred to the  Consumer Products Safety Commission (CPSC). The guidelines specified  that garments, including trim and seams, must self extinguish when  exposed to an open flame for 3 seconds.  The product must pass the test  new and again after going through fifty wash cycles.  
Polyester was a common fabric for baby pajamas at this time and  met the requirements for flame resistance due to its inherent qualities.   Other fabrics needed to be treated, and one of the first chemicalscancer developed for this function was  tris (2, 3-dibromopropyl) phosphate, commonly referred to as TDBPP,  tris-BP or just TRIS.  This process was short lived as research  uncovered the fact that it caused  and sterility in animals.  TRIS was  officially banned in 1977 and consumers were left with a bad impression  of chemical treatment and limited options for sleepwear.   
The public continued to show interest in the  softer and more comfortable option of 100 % cotton pajamas, so merchants  marketed cotton jumpers and other clothing as “daywear” or “playwear”.   The CPSC wanted to avoid confusion, so they amended the sleepwear  regulations in 1996.  Cotton garments were approved for use as sleepwear  if they fit the specification for snug fitting, the rationale being  that eliminating airspace, and thus oxygen, between the garment and the  child’s skin significantly reduces flammability.  It was also noted that  cotton pajamas were acceptable for babies under nine months due to their  limited mobility.  
In recent years, polyester and untreated cotton have been the  predominant types of children’s pajamas available to the public.  It has  been estimated that less than 1% of this sleepwear is actually treated  with any type of chemical, yet there is still controversy surrounding  this subject.  There are two main reasons for the current focus on this  topic.  First, a number of major lines of children’s clothing have  recently started selling 100% cotton pajamas treated with flame  retardant, which will be addressed below in the discussion of available  options.  The other reason, which has attracted much more public  interest, is the concern about brominated flame retardants. 
 
There is a growing body of evidence showing brominated flame  retardants are contaminating the environment and accumulating in the  human body.  The most widely studied and publicized of these chemicals  are the polybrominated diphenyl ethers (PBDEs), which have proven to  impair thyroid functioning and damage the nervous and reproductive  systems.  They have already been banned in Europe and the United States  is considering similar legislation.  While this issue is cause for  concern, these chemicals are not used in baby’s pajamas, as some sources  have mistakenly claimed.  They are most commonly found in computers,  televisions, mobile phones, automotive and construction materials,  mattresses, carpets and upholstered furniture.  Other types of  brominated flame retardants have been used in children’s pajamas, but it  is extremely uncommon. 
 
The most important thing that parents can do is become informed  about what they are purchasing.  If you do choose to buy treated  pajamas, contact the company to find out what they are using.  In  general, garments are referred to as flame resistant if the fabric meets  the CPSC guidelines without needing treatment, while the term flame  retardant is normally used if a chemical has been added.  Following is  an overview of the three most commonly available types of sleepwear. 
 
Polyester: 
 
Polyester is considered to be “inherently” flame resistant.   Flame retardants are actually chemically inserted during the  manufacturing process and become part of the molecular composition of  the fabric.  The resulting polymer is very stable, so there is little  likelihood that any chemicals could be released from the garment.  The  main complaint about polyester pajamas is that the fabric does not  breathe and can thus contribute to overheating and rashes.  You may also  want to consider the fact that polyester has a negative impact on the  environment, releasing nitrogen and sulphur dioxides, hydrocarbons,  carbon monoxide and heavy metals. 
 
Cotton treated with flame retardants: 
 
Many major lines of children’s clothing have recently started  marketing 100% cotton flame retardant pajamas.  Most of the companies  are using a treatment called PROBAN, which is made from the chemical  tetrakis hydromethyl phosphonium chlorida (THPC) and added to the fabric  or garment in the finishing stages.  During the process, the flame  retardant molecules penetrate the cotton fibers.  The fabric is then  dried and cured, which causes a water insoluble polymer to form,  essentially trapped inside the core of each fiber.  The end result  maintains all the desirable qualities of cotton, such as softness and  moisture absorbency.  If a flame comes into contact with PROBAN treated  cotton, an insulating char forms and protects the fabric from further  damage.  Studies indicate that the treated fabric has low migration of  any chemicals and does not cause any skin irritation, yet some consumers still have  concerns.  The THPC used in the process has been linked to genetic  abnormalities as well as damage to the liver, skin and nervous system.   It also promotes the growth of cancerous tumors.  Due to the potentially dangerous  nature of these chemicals, questions arise about the safety of the  manufacturing process and there has been no monitoring of environmental  exposure.    
Untreated Cotton: 
 
As mentioned above, cotton pajamas meet CPSC guidelines if they  are snug fitting.  These are the clear choice for many parents,  eliminating any concerns regarding chemical treatment either during or  after the manufacturing process. Some even recommend taking the next  step and buying only organic cotton sleepwear, which is made using no  pesticides.   
 
In the end, parents must decide if concerns about chemical use  and the environment outweigh their concerns about fire safety.  Many  children’s activist groups are in opposition to the CPSC’s decision to  include untreated cotton garments as acceptable sleepwear, while  environmental groups oppose the use of chemical additives.  Consumers  should continue to educate themselves about the issues and keep abreast  of current research so they can make informed choices.