Sleep is a skill that can be taught to a child at any age. It’s about helping them to recognize they have a tool that they don’t necessarily realize they have. With newborns, it’s about building that sleep skill from birth, without needing to formally sleep training, something we do all the time with newborns here. For infants, it’s about replacing props like rocking, feeding or bounding to sleep, all they know, with the skill of independent sleep, they sometimes need to be shown they actually can do. {If you only ever learned to walk upon your tippy-toes, for example, it takes some time to realize that oh, walking with your feet flat is actually much easier, and through practice that becomes the norm. It’s the same with sleep training an infant {4-17 months} as they don’t realize they actually have the ability because they were never taught. When working with a toddler or school-aged child who has sleep issues, it’s more about behavior modification, timing, and positive empowerment. Toddlers can typically sleep, they just ‘prefer’ how they do it today, i/e you laying with them, co-sleeping, hair twirling, and head rubs until they are asleep, with them requesting that you do it for them every single time they go to sleep or wake. Do, the long and short of it is that you can sleep train at any age. All children can learn the skill of sleep that is best for their cognitive, emotional, and physical development.