In most cases, we recommend starting with overnight sleep first and waiting to actively work on naps until overnight sleep has been in place for about a week.
For babies under 12 months, this staggered approach tends to be the most supportive and effective. Nighttime sleep is biologically easier to consolidate, and allowing naps to remain supported early on helps prevent overtiredness, which can interfere with progress.
For older babies and toddlers (around 12 months and up), some families may choose to begin gently applying the same approach to naps sooner, particularly for the first nap of the day. However, even at this age, many families still find greater success when nights feel more stable before focusing fully on naps.