There was a maybe 7-year-old child seated in front of us who just screamed, kicked, and was extremely difficult for the mother to handle. The flight attendants were extremely patient with the situation and someone other than the mother finally forcibly sat him down and tightly buckled him in so the plane could take off. Maybe he was autistic. At any rate, it was not pleasant for us passengers. The flight attendant at one point (or several) offered him candy. I was afraid the sugar could make him all the worse. or maybe there could have been no worse! At any rate, the attendants did their level best given such a situation. (not handling the child themselves, seeking to help the mom understand he needs to sit down, etc.)