First thing's first. What is a wake window?
A wake window is how long your child can handle being awake in one stretch (before a nap or bedtime). Knowing your child's wake window allows for nap time and bedtime to go a little more smoothly. It's never too early to start establishing a routine for your child and if a child isn't following a wake window, I always suggest to start them the day before or the day of sleep training. This allows for their body to start adjusting to the change ahead and often times allows sleep training to go a little more smoothly. Should your child follow this EXACT wake window? No. Every child is different, so some need more sleep time and others can go towards the longer stretch of awake time. That's why it's a window. You know your child best and understanding their needs is most important.
0-3 Months: 40-90 minutes of awake time
4-6 Months: 1.5-2.5 hours of awake time
6-8 Months: 2.5-3 hours of awake time
8-13 Months: 2.5-3 hours of awake time
13-18 Months: 4.5-6 hours of awake time.
Common age for 2 to 1nap transistion
18M-3 Years: 5-6 hours of awake time