How long doea a WW leap last?

Like what Gigi mentioned, the duration is dependent on which leap your baby is going through. So a quick reference, you can refer to the table in this article: http://www.babysleepsite.com/baby-sleep-patterns/wonder-weeks-chart-baby-toddler-sleep/ A short description and the approximate duration for each leap is noted in the table. Hope this helps!

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It depends on how many weeks your baby is at.... (according to EDD not birthdate). The app will tell you how long.