Tylenol or acetophenamin is one the drugs you tend to have around the house and is used commonly used for pain and fever reduction in people of all ages. However, it does have potentially very serious toxic side effects, and this is typically seen when there is an overdose, usually unintended, by a care provider administers more than they should or in the event a toddler, perhaps, or a little child takes a big drink of the liquid version of tylenol. The initial symptoms may be very mild or very subtle and not even be distinguishable from a mild stomache, but the implications for internal organs, particularly the liver, can be of extreme consequence. So if there is any indication that a small person has taken a larger dose of tylenol than they should have, this is the time to take them immediately to the emergency room. I don't think that calling your pediatrician's office is going to really be that helpful. These kids need to be seen in the emergency room and have blood tests done and, if need be, have emergency treatment initated because time is really of the essence now. You want to make sure that if there has been an ingestion that the speed of a response is significant.