ABC News' Linsey Davis, Daisha Riley and Roger Lee report:

How young is too young to bring a child to a fine dining restaurant? Diners at Alinea, a top Chicago eatery where the meal starts at $210 per person, faced that dilemma Saturday night when a couple brought their 8-month-old baby to dinner after the babysitter canceled last-minute.

"I could hear it crying in the kitchen," Grant Achatz, chef/owner of Alinea, todl "Good Morning America." "We want people to come in and enjoy and experience Alinea for what it is, but we also have to be cognizant of the other 80 people that came in to experience Alinea that night."

Rather than kick the couple out, Achatz tweeted to his nearly 82,000 followers, "Tbl brings 8mo.Old. It cries. Diners mad. Tell ppl no kids? Subject diners 2crying? Ppl take infants 2 plays? Concerts? Hate saying no,but.."

Grant Achatz posted this photo on Twitter and wrote "Definitely not baby food...," Jan. 12, 2014.

The question sparked debate, with one of his followers responding, "Little kids do not belong in high end restaurants" and another saying, "my feelings stand. No babies."

Some restaurants are going to the extreme by banning kids all together or saying no children seven and under after 7 p.m.

Chef Achatz says he does think children should experience fine dining at an early age, but that he hasn't decided where to draw the line.