Is it just a pink eye or red eye with discharge?
If its just a pink eye with watering, you can use a lubricant eye drops 8 times a day,to reduce his irritation along with cold
water compresses to soothen him until your appointment .
If he has significant discharge with matting of eyelashes, then clean it up with cotton soaked in warm water and use the lubricant drops 6 times a day. Antibiotic should be started after consultation as to assess the severity of the eye and the dosage of the drops especially in a pediatric age group.