Two bites can be the end
Two bites of a familiar food and none of the new one can be dinner. Hunger is not a score you have to win.
The meal can be short
Offer milk or water with the meal if those fit their allergies. Then let them leave the table.
Two bites and done is still a meal. The next food comes at the next snack, not as a contest five minutes later.
Drinks beside the plate
Water is the simple drink. Milk belongs only when milk is part of their diet. A milk allergy means milk stays off, including in a “just a sip.”
A huge drink right before the meal can be why the bites were few. Notice it, and leave a gap next time if you can.
Looking at the whole day
Breakfast, lunch, and snacks count. One short dinner does not describe the child.
Worry about growth belongs with your child’s doctor. This page cannot tell you if two bites is a problem.
A sentence you can say
“You can be done.”