Most 5-week-old babies sleep in stretches of 2 to 4 hours at night, waking to feed before falling back asleep. At this age, a total of about 8 hours of nighttime sleep is typical, but it comes in short chunks rather than one continuous block. Sleeping through the night (6 to 8 hours straight) doesn’t usually happen until at least 3 months of age, or until a baby weighs 12 to 13 pounds.
Why 5-Week-Olds Wake So Often
The main reason is stomach size. At one month old, a baby’s stomach is roughly the size of a large chicken egg, holding about 3 to 5 ounces per feeding. That small volume gets digested quickly, and hunger signals kick in again within a couple of hours. Newborns need 8 to 12 feedings spread across a full 24-hour day, so nighttime feedings are a biological necessity, not a bad habit.
Sleep cycles also play a role. Young babies spend a large portion of their sleep in a lighter, more active state (similar to REM sleep in adults). During these lighter phases, they’re far more likely to stir, fuss, or wake fully. Adults cycle through lighter sleep stages too, but we’ve learned to roll over and drift back off. A 5-week-old hasn’t developed that skill yet.
When You Can Let Them Sleep Longer
In the earliest weeks, many pediatricians recommend waking a newborn to feed if they haven’t eaten in 3 or so hours, especially if the baby hasn’t regained their birth weight. Once your baby shows a consistent pattern of weight gain and has passed the birth-weight milestone, it’s generally fine to let them sleep until they wake on their own. For most babies, this green light comes somewhere in the first few weeks of life.
At 5 weeks, if your baby is gaining weight well (roughly an ounce per day is a healthy pace), you can typically follow their lead at night. If they sleep a 3- or 4-hour stretch, that’s normal and healthy. Some babies at this age will occasionally surprise you with a 5-hour stretch. That’s fine too, as long as weight gain stays on track and they’re getting enough total feedings across the day.
The 6-Week Sleep Regression
Just as you start to see slightly longer stretches, a common disruption hits around the 6-week mark. This is sometimes called the 6-week sleep regression, and it often overlaps with a growth spurt. If your baby was starting to give you a nice 3- to 4-hour window and suddenly starts waking every 1 to 2 hours again, this is likely why.
Signs of this phase include more frequent night wakings, shorter naps during the day, difficulty settling at bedtime, and increased hunger. Your baby may seem restless during feeds or want to eat more often than usual. The sleep regression and the growth spurt tend to feed into each other: a growing body needs more calories, which means more waking to eat.
This phase typically lasts 2 to 6 weeks. It passes on its own, and sleep stretches gradually lengthen again afterward.
What a Typical Night Looks Like
A realistic night for a 5-week-old might look something like this: bedtime around 7 to 9 p.m., a feeding around 11 p.m. or midnight, another around 2 or 3 a.m., and possibly one more around 5 or 6 a.m. before starting the day. That’s roughly 8 hours in the crib with 2 to 3 wake-ups, which falls right in line with the average for this age.
Some parents find that a late-evening “dream feed” (feeding the baby right before the parent goes to bed, even if the baby is drowsy) can push that first stretch a bit longer, buying an extra hour or so of unbroken sleep. This doesn’t work for every baby, but it’s worth trying if you’re looking for a small edge.
Keeping Nighttime Sleep Safe
Because 5-week-olds spend so many hours asleep, the sleep environment matters a lot. Your baby should sleep on their back, on a firm, flat mattress with only a fitted sheet. No pillows, loose blankets, stuffed animals, or crib bumpers. A sleep sack or swaddle is the safest way to keep them warm. The American Academy of Pediatrics recommends that babies sleep in their own crib, bassinet, or portable play yard in the same room as a caregiver, and that parents avoid letting babies sleep on couches, armchairs, or in swings and car seats (except while actually in the car).
Helping Your Baby Build Longer Stretches
You can’t force a 5-week-old to sleep longer than their body allows, but you can set the stage for longer stretches to develop naturally. Exposure to daylight during awake periods and keeping the room dim and quiet during nighttime feedings helps your baby’s internal clock start distinguishing day from night. Many babies begin developing this circadian rhythm between 6 and 8 weeks, which is when you’ll often see the first noticeable improvement in nighttime sleep.
During night feedings, keep interactions calm and boring. Low light, minimal talking, no playtime. Feed, burp, change if needed, and put them back down. The goal is to reinforce the idea that nighttime is for sleeping, even when it’s punctuated by necessary wake-ups. Over the next month or two, those stretches between feedings will gradually lengthen as your baby’s stomach grows and their sleep cycles mature.