But most wait until the kids are out of preschool.
Not so for one man at a Wisconsin fair - the man ordered a beer for himself and one for his 4-year-old son.
His 2-year-old son got a sip as well.
The woman at the beer tent apparently thought it was a joke, according to the Associated Press story.
The father became belligerent when police approached him. The man apparently told the officer it is legal for minors to drink in Wisconsin if they have a parent with them.
The man was cited for disorderly conduct.