Nighttime Sleep: 9-15 Weeks Old


Okay, first of all, if your newborn is not sleeping at least 7 hours at night, I want you to just close the post and walk away. Don’t read it.

If you are still hear (rubbernecker huh?), let me first tell you that my babies at this age were not sleeping as long as I am about to talk about. They all turned out fine. They all slept this long at some point. So if your baby is not sleeping as long as I am about to talk about, don’t stress, don’t worry about what you are doing wrong–it is okay. Everything will be okay.

If your baby is 9-15 weeks old, here are some guidelines for night sleep.

Read: Everything You Need to Know About Wonder Week 19


A bottlefed baby can go up to 11 hours at night between feedings. This doesn’t mean she will or that she must, just that some babies in this age range can. Do not go more than 11 hours. (On Becoming Babywise page 121). Also note, a 9 week old won’t necessarily be at 11 hours. It can be a gradual process that is achieved by 15 weeks old.


A breastfed baby can go 9-10 hours at night. This doesn’t mean she definitely will or that she must, just that she can. Do not go over 10 hours between feedings. Just as with bottlefed baby, it can be a gradual process that is achieved by 15 weeks old.

If you let a breastfed baby go more than 9-10 hours at this age, you are risking milk supply issues. If  you are concerned with milk supply, stay on the 9 hour side of this range.

If you pump, you could try going 11 hours, but make sure you pump at 9 hours.


Now you know in quick reference how long you can let your 9-15 week old go through the night between feedings. Always be mindful of baby’s growth and of milk supply.

Related Posts/Blog Labels:

How useful was this post?

Click on a star to rate it 1-5!

Average rating 5 / 5. Vote count: 1

No votes so far! Be the first to rate this post.

As you found this post useful...

Follow us on social media!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?