A 4-month-old needs 12 to 16 hours of total sleep per day, split between nighttime and naps. Most babies this age sleep 11 to 12 hours at night (with one or two feedings) and take about 4 hours of naps during the day, spread across four naps.
Nighttime Sleep at 4 Months
By 4 months, most babies can handle a longer stretch of nighttime sleep, often going 5 or more hours between feedings. A typical night lasts 11 to 12 hours total, with one optional feeding waking. Some babies still wake twice, which is normal, but waking more than twice a night to feed at this age may signal a habit rather than genuine hunger.
Daytime Naps
Four naps a day is standard for a 4-month-old, adding up to roughly 4 hours of daytime sleep. Don’t expect uniform naps. You’ll likely see a mix: a couple of shorter naps lasting 30 to 60 minutes and one or two longer stretches of 1 to 2 hours. Nap lengths can vary wildly from day to day, and that’s normal at this age.
The key timing tool is the wake window, which is the stretch of awake time your baby can handle between sleep periods. At 4 months, that window is about 1.5 to 2 hours. Pushing past it tends to backfire, making your baby harder to settle rather than more tired.
Signs Your Baby Is Ready for Sleep
Watching for sleepy cues within that wake window helps you put your baby down before they tip into overtiredness. Early signs include yawning, droopy eyelids, staring into the distance, and turning away from sounds, lights, or feeding. Physical cues like rubbing their eyes, pulling on their ears, or clenching their fists also signal that sleep is close.
Overtired babies are paradoxically harder to get to sleep. One common trap: a baby who seems to be crying for food but refuses the bottle or breast. That’s often tiredness masquerading as hunger. The better you learn your baby’s baseline personality, the easier it becomes to spot the cranky, verging-on-sleepy version before a full meltdown.
The 4-Month Sleep Regression
Right around this age, many parents notice sleep suddenly falls apart. Babies who had been sleeping in longer stretches start waking more frequently, and naps may shorten. This isn’t a setback. It’s a permanent, healthy change in how your baby’s brain handles sleep.
In the first few months, babies spend most of their sleep time in deep sleep. Around 4 months, their sleep architecture matures to cycle between light and deep phases, more like adult sleep. The problem is that during those new light-sleep phases, babies are more easily roused and haven’t yet learned how to drift back to sleep on their own. The disruption typically lasts 2 to 6 weeks, then improves as your baby adjusts to the new pattern.
Sleep Safety at 4 Months
Four months is a pivotal age for sleep safety because many babies start rolling over. If your baby is showing any signs of trying to roll, stop swaddling immediately. A swaddled baby who rolls onto their stomach can’t use their arms to reposition, which creates a suffocation risk. Transitioning to a wearable sleep sack keeps your baby warm without restricting arm movement.
The core safe-sleep guidelines from the American Academy of Pediatrics apply through the entire first year:
- Back sleeping. Place your baby on their back for every sleep, including naps.
- Firm, flat surface. Use a crib, bassinet, or portable play yard with a firm mattress and a fitted sheet. The surface shouldn’t indent when your baby lies on it.
- Empty sleep space. No pillows, blankets, stuffed animals, bumper pads, or weighted products of any kind.
- Room sharing, not bed sharing. Keep your baby’s sleep area in your room for at least the first 6 months, but not in your bed.
- Avoid overheating. Your baby needs one more layer than you’d wear in the same room. Watch for sweating, a hot chest, or flushed skin.
Offering a pacifier at nap time and bedtime is also associated with safer sleep. If you’re breastfeeding, wait until nursing is well established before introducing one.
Putting It All Together
A realistic day for a 4-month-old looks something like this: wake up after an 11- to 12-hour night (with one or two feeds mixed in), stay awake for about 1.5 to 2 hours, then go down for the first of four naps. Those naps add up to around 4 hours total, bringing the full day to roughly 15 or 16 hours of sleep. Some babies land closer to 12 hours and do just fine.
The range exists because babies vary. A baby consistently getting 12 hours who is gaining weight, alert when awake, and meeting milestones is getting enough sleep, even if that number looks low compared to the upper end of the range. The pattern matters more than hitting an exact number: relatively predictable wake windows, a mix of naps through the day, and a longer consolidated stretch at night.