Patient description: A 4 year old boy presents to the emergency room with wheezing. He has had a history of allergic rhinitis, but no history of wheezing. His mother reports that 5 hours ago patient was playing in the backyard sandbox when she heard him suddenly start coughing. The coughing lasted only moments, but he has been audibly wheezing since. Mother was concerned, because his breathing has not returned to normal, so she brought him to the ED. On exam, the child is playful and well appearing. Wheezing is heard in the mid-right chest area. O2 sats are 100% on room air.

Clinical trial eligibility criteria: eligible ages (years): 0.5-999.0,  Healthy Volunteers Only All children between the ages of 6 months to 12 years of age who are typically developing and born of a full term pregnancy if under 24 months of age, healthy, and English speaking are eligible for in the study. Typically developing children would not have any diagnosed congenital conditions, developmental delay or disability, dyslexia, PDD, ADD, ADHD, or ASD. In addition, we will only enroll subjects if they are from a racial and ethnic group that is still needed to ensure the diversity and representative nature of our sample as set forth in the Planned Enrollment Form. These are the initial screening that will be used  Children outside of the 6 month-12 year age range: These years cover early life and are the ages of interest for children s play and are of central significance to the Consumer Product Safety Commission s goals Families not fluent in English: Fluency in English is essential for parents to be able to fill out surveys. Families also need to be fluent in English so that they can comprehend verbal directions given by the experimenter during the testing session. If we included people who were not fluent in English, we would need many additional staff members who speak the multitude of languages of the diverse population of the Washington, D.C metro area to work with participants during the testing session and code the videos after the testing session is complete Children who are sick, not typically developing, born premature (if they are under 24 months of age), blind, or deaf: We must recruit a healthy sample of typically developing children born in a full term pregnancy (if they are under 24 months of age) who are not blind or deaf for this project to remove any potential confounds that atypical conditions may have on children s play. Typically developing children would not have any diagnosed congenital conditions, developmental delay or disability, dyslexia, PDD, ADD, ADHD, or ASD. Including other populations such as deaf or blind children would require a different experimental set up, stimulus toys, and resources (i.e., someone who could convert our surveys to American Sign Language or Braille and could code the videos for the parent child behaviors during those sessions) Children who are not adding to the ethnic and racial diversity of the sample: The goal of our study is to recruit a sample of subjects who are racially and ethnically diverse. By making this diverse sample a priority, we hope that our results will be applicable to the diverse populations residing within the United States. To keep with this goal of a diverse and representative sample of children, we may have to some families if we have already reached the quota of families from that particular racial or ethnic group