It is undisputed that babywearing can calm children down. Infants cry the most in the age of 6 weeks; in 1986, a research team at McGill University showed in a randomized study that infants of that age cried significantly less if their parents wore them a lot on the body during the day.[47] Sears recommends babywearing for the purpose of settling a baby to sleep, too.[48] He approves on the use of a sling up to the age of 3, since childwearing can also be used to calm a misbehaving toddler down.[49] Other pediatricians find it disputable to wear children beyond the age of 9 months permanently on the body, arguing that this is against the child's natural desire for autonomy.[50]