Why Won’t My Baby Sleep: Common Causes And Fixes
If your baby will not sleep, the cause is often simple: hunger, discomfort, too much tiredness, too little sleep pressure, or a sleep pattern that is still developing. In the United States, the American Academy of Pediatrics (AAP) advises placing babies on their backs for every sleep on a firm, flat surface with no loose bedding, pillows, or soft objects.
Newborn sleep is also uneven. Many babies wake often to feed and may not sleep for long stretches until their body clock matures. This guide explains why babies resist sleep, what you can try tonight, and when to call your child’s doctor.
How much sleep does a baby need?
Most babies need several sleep periods across the day and night. Their total sleep matters more than one long night stretch.
The American Academy of Sleep Medicine gives these general 24-hour sleep ranges:
| Age | Recommended total sleep in 24 hours | What this may look like |
|---|---|---|
| Birth to 3 months | 14–17 hours | Many short naps and night wakes |
| 4 to 12 months | 12–16 hours, including naps | Longer night sleep for some babies, plus naps |
| 1 to 2 years | 11–14 hours, including naps | Fewer naps and a more regular schedule |
These ranges are guides, not targets that every baby will meet each day. A healthy baby may sleep more or less on occasion.
A baby who wakes at night is not always sleeping poorly. Young babies have small stomachs and may need to feed often. Sleep also changes during growth, illness, travel, teething, and new movement skills.
Why won’t my baby sleep?
The most common reasons are hunger, discomfort, an immature body clock, and a sleep schedule that does not match the baby’s needs. Several causes can happen at the same time.
Your baby is hungry
Newborns often wake to eat every few hours. Some older babies also wake when they need more milk during a growth period.
Do not reduce night feeds or expect long sleep stretches unless your baby’s health care professional says it is appropriate. Feeding needs vary by age, weight gain, health, and whether your baby receives breast milk, formula, or both.
Contact your pediatrician if your baby feeds poorly, has fewer wet diapers than usual, vomits repeatedly, or is difficult to wake.
Your baby is overtired
An overtired baby may cry, arch their back, stare into space, or become harder to calm. Being awake too long can make it harder to fall asleep, even when the baby is clearly tired.
Early sleep cues may include:
- Yawning
- Looking away
- Less movement
- Rubbing the eyes
- Losing interest in play
- Becoming quiet or fussy
Try to begin the sleep routine at the first clear signs of tiredness. Do not wait until your baby is crying hard if you can avoid it.
Your baby is not tired enough
A baby may resist sleep after a long nap or a short time awake. This is more common in older babies who are moving from several naps to fewer naps.
If your baby is calm, alert, and playful at bedtime, the sleep period may be starting too early. Shift the routine in small steps rather than making a large change at once.
Your baby has day-night confusion
Newborns do not always have a strong difference between day and night. Before birth, movement may have helped soothe them during the day. After birth, the light-dark pattern takes time to develop.
During the day:
- Open curtains.
- Use normal household sounds.
- Offer regular feeds.
- Include short periods of calm activity when your baby is awake.
At night:
- Keep lights low.
- Speak softly.
- Change the diaper only when needed.
- Return to sleep after feeding and burping.
This does not force a newborn to sleep through the night. It helps the body learn when night begins.
Your baby is uncomfortable
Common sources of discomfort include:
- A wet or soiled diaper
- Gas
- Reflux symptoms
- Being too hot or too cold
- A tight waistband or rough clothing
- Nasal congestion
- Constipation
- Illness
- Teething
Check your baby’s body and clothing. Keep the room comfortable, but avoid overheating. The AAP recommends dressing a baby in no more than one extra layer than an adult would wear in the same room.
Do not place a baby to sleep in an inclined product, swing, car seat, or other sitting device. If your baby falls asleep there, move them to a firm, flat sleep surface as soon as practical.
Your baby needs help changing sleep conditions
Some babies fall asleep only while feeding, rocking, walking, or being held. These methods are not automatically harmful. They may become difficult when your baby wakes and expects the same help each time.
Once your baby is older and feeding and growth are going well, you can slowly add other calming steps. For example, feed first, then use a short song, cuddling, and a consistent phrase before placing your baby down.
Your baby is going through a normal change
Sleep may worsen for a time when a baby:
- Learns to roll, crawl, stand, or walk
- Becomes more aware of separation
- Starts child care
- Has a growth spurt
- Has a cold
- Travels or changes time zones
- Drops a nap
These changes can disrupt sleep without meaning that something is wrong. Keep the sleep setting safe and return to a steady routine when you can.
What to do when your baby will not sleep
Start with safety and basic needs. Then make the routine calm, short, and repeatable.
1. Check for a medical or feeding need
Before changing sleep habits, check whether your baby may be hungry, sick, in pain, or having trouble breathing. Look for fever, vomiting, diarrhea, poor feeding, unusual sleepiness, or a major change in wet diapers.
If your baby is younger than 3 months and has a rectal temperature of 100.4°F (38°C) or higher, call a health care professional promptly. Do not give medicine to a young baby without medical advice.
2. Use a safe sleep space every time
Place your baby:
- On their back
- On a firm, flat mattress
- In a crib, bassinet, or portable play yard that meets current safety standards
- With only a fitted sheet
- In the same room as you, but not in the same bed
Keep pillows, blankets, bumper pads, stuffed toys, and positioners out of the sleep space. Do not use weighted blankets, weighted swaddles, or weighted sleep products for babies.
If you swaddle, place the baby on their back and stop swaddling as soon as they show signs of trying to roll. A sleep sack that allows free movement may be used after swaddling ends.
3. Follow a short bedtime routine
A routine does not need to be long. Ten to 20 minutes may be enough.
A simple routine could be:
- Dim the lights.
- Change the diaper and put on sleep clothing.
- Feed your baby if needed.
- Burp and cuddle.
- Sing one quiet song.
- Place your baby in the sleep space.
Use the same order most nights. Predictable steps act like a bridge from active time to sleep.
4. Put your baby down when calm and drowsy when possible
“Drowsy but awake” can help some babies learn to settle in their sleep space. It is not a test of good parenting, and it does not work every time.
If your baby cries as soon as you put them down, pause briefly to see whether they settle. If the crying builds, comfort them. You can pick up the baby, calm them, and try again. Avoid leaving a distressed baby in an unsafe place.
5. Protect naps
Very long or late naps may reduce sleep pressure at bedtime. Too little daytime sleep may lead to overtiredness.
Keep a simple three-day record of:
- Wake time
- Feed times
- Nap start and end times
- Bedtime
- Night wakes
- Possible discomfort
Patterns are easier to see on paper. Do not change several things at once, or you may not know what helped.
A practical troubleshooting guide
Use the symptom that best matches what you see. A single sign does not prove one cause.
| What you notice | Possible reason | What to try |
|---|---|---|
| Baby cries soon after being placed down | Hunger, discomfort, startle, or need for contact | Check feeding, diaper, temperature, and burping; use a calm routine |
| Baby wakes every 1–3 hours | Normal feeding need, sleep-cycle waking, or illness | Ask the pediatrician about feeding; keep night care quiet and safe |
| Baby fights every nap | Overtiredness, poor timing, or too much stimulation | Start the nap routine earlier and darken the room |
| Baby sleeps only while held | Strong sleep association or need for soothing | Add a repeatable routine and practice one sleep period in the crib |
| Baby wakes very early | Hunger, light, noise, or an early bedtime | Keep the room dark and quiet; review the full 24-hour schedule |
| Baby suddenly sleeps poorly | Illness, travel, developmental change, or schedule shift | Check for symptoms and return to a familiar routine |
If your baby is under 4 months, avoid rigid sleep-training plans and follow guidance from your pediatrician. Babies differ in feeding needs and development.
For older infants, parents may choose a gradual settling method, timed checks, or another behavior-based approach. Research suggests that some structured approaches can improve infant sleep, but no one method suits every family. A pediatrician can help you choose an approach that fits your baby’s age, health, feeding, and temperament.
Safe sleep mistakes to avoid
Tired parents often look for quick fixes. Some popular approaches can create serious risks.
Do not use inclined sleep products
Inclined sleepers, swings, bouncers, and car seats are not routine sleep spaces. Their angle can affect a baby’s ability to keep the airway open.
A car seat is needed for travel. Once you arrive, move a sleeping baby to a firm, flat surface.
Do not add soft items to the crib
Blankets, pillows, stuffed animals, crib bumpers, and sleep positioners can increase the risk of suffocation or entrapment. Keep the crib bare.
Do not use unsafe sleep aids
Avoid products that claim to keep a baby in one position or make a baby sleep more deeply. Never give melatonin, antihistamines, herbal products, or other medicine to make a baby sleep unless a qualified clinician directs you.
Do not assume every cry means a sleep problem
Crying can signal hunger, pain, illness, overstimulation, or a need for contact. It is communication, not proof that your baby is being difficult.
If you feel overwhelmed, place your baby on their back in the crib and step away for a few minutes. Never shake, hit, or roughly handle a baby. Call someone you trust for help.
When to call your baby’s doctor
Call your pediatrician when sleep problems continue with signs of poor health or feeding. Useful reasons include:
- Poor weight gain or trouble feeding
- Fewer wet diapers than usual
- Repeated vomiting
- Ongoing diarrhea
- Persistent cough, wheezing, or noisy breathing
- Loud snoring or pauses in breathing
- Severe congestion that affects feeding
- A sudden and lasting change in behavior
- Pain that does not improve
- A baby who is hard to wake or unusually weak
Call 911 for severe trouble breathing, blue or gray lips or skin, unresponsiveness, choking that does not clear, or another emergency.
A sleep problem without these signs is often manageable with time and a steady plan. Still, you do not need to wait for an emergency to ask for help. Your child’s doctor can review feeding, growth, sleep timing, and possible medical causes.
Frequently asked questions
Why does my baby sleep during the day but not at night?
Newborns may have an immature body clock and may not yet know the difference between day and night. Use bright light and normal activity during the day, then keep nighttime care dark, quiet, and brief.
Why does my baby wake up when I put them down?
Your baby may notice the change from a warm body to a still sleep surface. Start with a safe sleep space, then try a calm transfer after feeding and burping. Some babies also wake because they are hungry, uncomfortable, or overtired.
Should I let my baby cry to sleep?
There is no single method for every family. Young babies may need prompt comfort for feeding, illness, or distress. For older infants, discuss behavior-based sleep methods with your pediatrician and use a plan that keeps the sleep space safe.
Can teething cause poor sleep?
Teething may make some babies more irritable, but not every sleep change is caused by teething. Fever, diarrhea, breathing problems, or marked illness should not be dismissed as teething. Ask a clinician about safe pain relief.
How can I get more sleep as a parent?
Share night care when possible, accept practical help, and rest when another trusted adult is available. If you are so tired that you might fall asleep while holding your baby, place the baby in the crib before you doze off. Avoid couches and armchairs for infant sleep.
Key takeaways
- Babies may resist sleep because they are hungry, overtired, uncomfortable, not tired enough, or still developing a day-night rhythm.
- Start with feeding, health, comfort, and safe sleep checks.
- Use a short, repeated routine and protect naps.
- Keep every sleep on the baby’s back, on a firm, flat surface, with no loose items.
- Ask your pediatrician about poor feeding, breathing problems, fever, dehydration, or a sudden major change.
- Sleep often improves in stages. A calm and consistent plan matters more than a perfect night.
Conclusion
When your baby will not sleep, look for the basic cause before trying a sleep program. Meet feeding and comfort needs, use a safe sleep space, and keep the bedtime routine simple. If the problem comes with poor feeding, breathing changes, fever, or unusual behavior, contact your baby’s health care professional.
For additional U.S. guidance, review the American Academy of Pediatrics safe sleep recommendations, the AAP clinical policy on safe infant sleep, and the American Academy of Sleep Medicine sleep-duration recommendations.
