Does crying it out change a baby's personality?

There is no evidence that crying it out will change a baby's personality. Additionally, there is no evidence that using the cry-it-out approach will affect the attachment between a parent and child when used during sleep times with attachment activities during the day. Within the Lovebug community, there have been some reports of personalities changing after sleep training, but that is normally because the baby is getting significantly more sleep. When a child is overtired, they are hyper, silly, giggly and have attention disorders. Many parents will describe their babies and toddlers as "silly" when the baby is in fact overtired. So, once the babies are getting sleep, they are usually calmer and the silliness and hyperactivity will go away.