Half of parents say their child used a pacifier and one-quarter say their child sucked their thumb or fingers. 4 in 5 parents think pacifier use should stop at or before age 2, but only 3 in 5 parents think thumb-sucking should stop by that age. 1 in 11 parents feel they acted too late to stop their child’s pacifier use, compared to 1 in 6 parents for thumb-sucking.