This answer is often confusing for families because there is no one answer, and not even experts agree. Some experts base it on weight, age, or developmental milestones and this can be frustrating for parents. I take each family’s unique situation into account (including the baby’s temperament, the parent’s temperament, family dynamics, developmental age, etc.) before embarking on any type of sleep journey. Most babies can start learning and practicing independent sleep right from the start so it’s never too early to start.