Parents inquire about their five-month-old infant experiencing abnormal bowel movements and red and swollen bottom, wondering if they have health issues.

The son experienced symptoms such as headache, tears, and eye pain after sleeping in a newly renovated room with a small opening for two hours. These symptoms persisted for about 40 minutes. After going for a walk and drinking milk, the symptoms disappeared. I would like to inquire if these reactions are due to toxic substances like formaldehyde, and what treatment should the son receive? I am very worried.