I have encountered this problem even with grown ups, not only with children. People should understand that food is not to be wasted in any case. By ordering a separate full dish for each person instead of trying to share, invariably results in wastage of food.
Perhaps, it will not be out of context to mention here that in USA, restaurants have separate menu for children and in each family restsurant, high chairs with safety belt are made available for children's seating. Often they provide crayons also to colour the drawing printed on the backside of the menu.
For infants, they provide tables with adequate space on the side to keep infant's strollers.
Let us encourage each other in sharing knowledge.
"Earning knowledge is by sharing it with ISC and we will rectify our mistakes."
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
So we should plan carefully even in talking also when we go out with our children.
When we have smaller kids, we need to plan their bottle feeds, infant feeds etc and carry a separate bag so that their food needs are met in time and with ease.