Month 4 Baby Sleep: What to Expect

Key Takeaways:

• As baby’s sleep cycles mature, bedtime battles, nighttime wakings, and shorter naps become common.
• During this time, focus on soothing baby through this developmental transition while laying the groundwork for sleep training.
• Hatch Baby can help you soothe your four-month-old with gentle light and audio, plus expert support from sleep consultants.

The fourth month comes with lots of exciting milestones, including the notorious four-month sleep regression. As your baby's sleep cycles mature, they may have trouble falling asleep, resist naps, or wake up more frequently throughout the night. While these changes can be frustrating, it actually means your baby's development is right on track.

Deep breaths! Until baby’s sleep cycles fully mature, there’s a lot you can do to tame bedtime battles and set the stage for healthy sleep habits. Here’s what to know, and how Hatch Baby can help you navigate all of it.

Table of Contents

1. What to Expect During Baby’s Fourth Month
2. Tips for Baby Sleep at 4 Months
3. FAQs
4. References

What to Expect During Baby’s Fourth Month

Understanding how your baby's sleep changes during the fourth month can help you feel more prepared for what comes next.

Milestones

• As your baby’s sleep cycles mature, they may wake more frequently between cycles (known as the four-month sleep regression).
• Babies may sleep longer at night but take shorter daytime naps (30-45 minutes), because daytime sleep takes longer to consolidate.
• As your baby becomes more aware of their surroundings and caregivers, they may resist naps and bedtime when separated from them.
• Many babies want to feed every two hours again for comfort and soothing during this developmental phase.

Sleep Goals

• Most babies sleep 15-16 hours per day, slightly less than during the newborn stage.
• Aim for 90-minute wake windows and 3-4 naps daily as sleep schedules become more predictable. Some babies may transition from four naps to three at this age.
• The sleep regression is a great sign baby is ready to learn how to self soothe and fall asleep independently. If you haven’t already, you can consider gentle sleep training.

Tips for Baby Sleep at 4 Months

The sleep regression can be challenging, but there’s a lot you can do to prepare your baby for the next phase (which hopefully includes more sleep for everyone). Here are a few things to try.

Play During the Day

Keeping your baby active and engaged during the day can help them build sleep pressure for better rest at night while supporting developmental milestones. Prioritize tummy time and floor play to strengthen their head, neck, and upper body muscles as they practice rolling and pushing up on their arms. Interactive games like peek-a-boo, talking, singing, and mimicking your baby's babbles and squeals can also support emerging communication and social skills.

Set the Stage for Sleep Training

Even if you're not ready to start sleep training, you can begin building habits that support more consistent sleep. Aim for consistent wake windows of 1 hour and 30 minutes-1 hour and 45 minutes and try putting your baby in the crib while they're still fully awake to help them practice falling asleep on their own. When your baby wakes at night, consider giving them a few minutes to resettle before stepping in, as long as they don't need feeding or care.

Use Sound Strategically

Consistent background sound on your Hatch Baby can help mask noises that might wake your baby, including sounds from their own movement as they roll or reposition. This can be especially helpful during the four-month sleep regression, when babies may wake more frequently between sleep cycles. Try playing a continuous ocean sound throughout the night to create a soothing, predictable sleep environment.

Don’t Be Discouraged

The 4-month sleep regression can be exhausting, but remember: This phase is temporary. Your baby's sleep cycles are maturing, and the extra wake-ups don't mean you've lost progress you've made. If you haven’t started already, sleep training can help the regression pass. Not sure where to start? Learn more about how to sleep train in the Hatch Baby Sleep Guides in app.

We’ve got your back. Hatch Baby offers soothing sounds, gentle light, and personalized guidance from Hatch Sleep Consultants to help you navigate all the ups and downs of baby sleep.

Frequently Asked Questions

Is it safe for a 4-month-old baby to sleep on their stomach?

Always place your baby on their back for every sleep. If your baby can roll independently in both directions, you generally don't need to reposition them if they roll onto their stomach. Make sure they're sleeping on a firm, flat surface without blankets, pillows, or toys.

Should I stop swaddling my 4-month-old?

Yes. Stop swaddling as soon as your baby shows signs of attempting to roll, which often happens before four months. Transition to an arms-free sleep sack to keep your baby comfortable while allowing them to move safely during sleep.

When should I move my 4-month-old baby to their own room?

The American Academy of Pediatrics (AAP) recommends room sharing with your baby for at least the first 6 months, as it can support both safety and peace of mind. But every family is different, and by 4 to 5 months, some parents begin to notice that everyone sleeps better with a bit more space.

References

1. American Academy of Pediatrics. (2022). How to keep your sleeping baby safe: AAP policy explained. HealthyChildren.org.https://www.healthychildren.org/English/ages-stages/baby/sleep/Pages/a-parents-guide-to-safe-sleep.aspx
2. Centers for Disease Control and Prevention. (2026, February 16). 4 month online milestone checklist.https://www.cdc.gov/act-early/digital-online-checklist/4-months.html
3. Ben-Joseph, E. P. (2022, July). Baby sleep: 4- to 7-month-olds. Nemours KidsHealth. https://kidshealth.org/en/parents/sleep47m.html