Why Is My Baby Not Sleeping in the Bassinet? 5 Fixes for Newborn Bassinet Sleep Struggles

Quick answer

If your baby won't sleep in the bassinet, start by checking the basics: room temperature, swaddle, and timing. Most newborn bassinet sleep problems come from overstimulation, discomfort, or a too-warm room. Try a consistent pre-sleep routine, use a 0.5 TOG sleep sack for warm rooms, and give it at least two weeks before considering a switch to a crib.

You've set up the bassinet, dimmed the lights, and followed all the newborn sleep tips—but your baby still fusses the moment you lay them down. You're not alone. Newborn bassinet sleep problems are one of the most common challenges for new parents, and the good news is that most have simple, practical fixes.

In this guide, we'll walk through five specific reasons your baby might resist the bassinet and what to do about each. We'll also help you recognize when it's time to try a different sleep surface, like a crib, and how to make that transition smoother.

1. Room temperature is off

Newborns can't regulate their body temperature well, so a room that's too warm or too cool can make them restless. The ideal room temperature for sleep is between 68-72°F (20-22°C). If your baby is sweating, has a hot chest, or feels clammy, they're likely overdressed or the room is too warm.

For warmer rooms (75-80°F), a 0.5 TOG sleep sack is ideal. The Coccoli Modal Sleep Sack - 0.5 Tog - Trucks is designed for exactly these temperatures and is made from breathable Lenzing Modal, which helps wick moisture and keep your baby comfortable. If your room is cooler, you may need a higher TOG or an extra layer.

• Check the room temperature with a thermometer, not your own comfort.
• Dress your baby in one more layer than you'd wear, but no more.
• Use a sleep sack instead of loose blankets for safe, consistent warmth.

2. The swaddle isn't right

Newborns have a strong startle reflex that can wake them. A proper swaddle helps them feel secure, but if it's too loose, too tight, or the wrong fabric, it can cause more fussing. If your baby is breaking free or seems uncomfortable, try a different swaddle or a sleep sack that allows arm movement.

Some babies prefer a sleep sack with arms free, especially as they get older. The Coccoli Modal Sleep Sack is a good option because it has a J-shaped double zipper for easy diaper changes and comes in a soft, stretchy fabric that moves with your baby. If your baby is under 2 months and still startles, a traditional swaddle might be better.

• Make sure the swaddle is snug but not tight—you should be able to fit two fingers between chest and fabric.
• If your baby is rolling over, stop swaddling immediately.
• Consider a sleep sack with a zipper for easier nighttime changes.

3. They're not actually tired yet

Newborns have very short wake windows—often only 45-60 minutes. If you miss that window, your baby can become overtired, which makes it harder to fall asleep and stay asleep. Watch for early sleepy cues like eye rubbing, yawning, or pulling at ears, and start your pre-sleep routine then.

A consistent bedtime routine helps signal to your baby that it's time to sleep. This can be as simple as a warm bath, a feeding, a book, and a lullaby. The key is doing the same thing every time, so your baby learns to associate these cues with sleep.

• Track wake windows to find your baby's natural rhythm.
• Start the routine 10-15 minutes before you expect them to be sleepy.
• Keep the room dim and quiet during nighttime feeds.

4. The bassinet feels different

Your baby spent nine months in a warm, snug, and noisy environment. A flat, quiet bassinet is a big change. Some babies need more help feeling secure. Try using a white noise machine, a warm (not hot) water bottle to pre-warm the bassinet (remove before placing baby), or a swaddle that mimics the womb.

You can also try placing your baby in the bassinet when they're drowsy but not fully asleep, so they learn to self-soothe. If they cry, pick them up, calm them, and try again. It may take several tries, but consistency helps.

• Use a white noise machine to block out household sounds.
• Warm the bassinet sheet with a hot water bottle before putting your baby down.
• Try a gentle hand on their chest and soft shushing as they drift off.

5. They're hungry or need a diaper change

Sometimes the simplest explanation is the right one. If your baby is waking frequently, they might be hungry or have a wet diaper. Newborns need to eat every 2-3 hours, and some babies are sensitive to a wet or soiled diaper.

Make sure you're offering a full feeding before putting them down, and check the diaper right before sleep. If they wake after a short nap, try a quick feed and see if they settle back down. If they're gaining weight well, you can let them sleep a little longer between feeds, but always follow your pediatrician's guidance.

• Offer a full feeding before sleep, but not so much that they spit up.
• Use a diaper that's designed to keep wetness away from the skin.
• Keep a dim light on for nighttime changes to avoid overstimulation.

Diagnosis: Is it a bassinet problem or a bigger sleep issue?

• Symptom: Baby cries immediately when placed in bassinet: This often indicates a preference for being held or a need for more soothing. Try a swaddle, white noise, and a pre-warm the mattress. If they settle within 10 minutes of your soothing, it's likely a transition issue.
• Symptom: Baby sleeps only when held, wakes on transfer: This is common in the newborn stage. Use a gradual transfer method: lower them slowly, keep a hand on their chest, and wait a few minutes before removing your hand. If they wake every time, consider a sleep sack that mimics the feeling of being held.
• Symptom: Baby sleeps fine in a crib but not a bassinet: Some babies prefer the larger space or different feel of a crib. If your baby is under 4 months, you can still use a bassinet, but if they clearly prefer the crib, it's okay to switch. If they're sleeping better in a crib, you don't have to force the bassinet. Move to the crib and use the bassinet for travel or naps.

Products that can help

• Coccoli - Modal Sleep Sack - 0.5 Tog - Trucks: Coccoli's much-loved sleep bag is ethically made in India and made of a sustainable Lenzing Modal® which makes this impossibly soft and a fan favorite. It features a superior YKK J-shaped double zipper, which makes it super easy to use. At 0.5 TOG, it's the ideal warmth for those warmer seasons. 0.5 TOG, ideal room temperature 24-27 C (75 to 80 degrees F). If your room is on the warmer side, this sleep sack keeps your baby comfortable without overheating, and the double zipper makes middle-of-the-night diaper changes faster.
• Kyte Baby - Long Sleeve Bodysuit - Midnight: The Kyte Baby Long Sleeve Bodysuit in Midnight is the everyday layering essential our team hand-selects for every new wardrobe — cut from silky smooth bamboo rayon with just enough spandex for gentle, unrestricted stretch. A soft, breathable base layer helps your baby stay comfortable in the bassinet without extra bulk, reducing the chance of overheating or irritation.
• Babyletto - Swell 4-in-1 Convertible Crib - White: The Babyletto Swell 4-in-1 Convertible Crib in White brings playful, thoughtful design to the modern nursery — and a piece our team loves for its signature rounded posts, which provide a safe, natural grip for wobbly toddlers as they find their footing. A crisp White finish and sustainably sourced solid New Zealand pine combine with GREENGUARD Gold certification for a crib that’s as safe as it is... If your baby consistently sleeps better in a crib, this convertible option grows with them from crib to toddler bed, making it a long-term investment.

Newborn bassinet sleep problems are almost always solvable with patience and a few tweaks. Start with the basics—temperature, swaddle, and routine—and give each change at least a few nights to work. If your baby still won't sleep in the bassinet after trying these fixes for two weeks, or if you're concerned about their sleep or health, talk to your pediatrician. And remember, every baby is different; what works for one might not work for another.