Your child must be old enough and willing to go along with the procedure, which isn't painful but does feel strange at first. (babycenter.com)
Some mothers give their baby the small weaning spoon to play with for a few days before the first meal so that it does not feel strange in their mouth. (bounty.com)
The unfamiliar nature of this exercise means that it does feel strange at first but once you get accustomed to it this soon disappears. (unique-bodyweight-exercises.com)