They do not have to taste it today
A food can sit on the plate for several meals before a taste happens. That is a normal pace.
Hunger is a poor teacher
Keep serving the familiar food so they are not hungry while they learn. Hunger is a poor teacher.
A taste on day four is still a success. A taste forced on day one is often the end of the food.
What still counts
Looking, touching, smelling, and leaving it there all count as the food being offered. You do not need a bite to justify cooking it.
Serve a small amount so the uneaten part is not a waste you resent.
When to pause
Pause if the offer has become tears. Return on another day, still beside the familiar food, still small.
If you are worried they are eating very little overall, talk to your child’s doctor. Do not use one new food as the test.
A sentence you can say
“You don’t have to taste it today.”