A case of acute ethanol intoxication in a 3-month-old female is reported. She accidentally ingested 12.2 g of ethanol (2.1 g/kg of body weight), which is considered to be lethal even in adults. However, she did not present any serious symptoms and rapidly recovered with only supportive care without peritoneal dialysis. She is now 5 years old and has been developing well without any neurological sequelae. This is the youngest of the reported cases of acute ethanol intoxication, suggesting a higher clearance rate of ethanol in an infant than hitherto estimated from adult cases.