When should you start sleep training? Signs your baby is ready

What is baby sleep training?

Sleep training refers to the stage of a baby’s development when they may begin learning how to fall asleep more independently and sleep for longer stretches overnight.¹ For many families, successful sleep training can feel like an important milestone, as it supports a baby’s ability to self-soothe and can help everyone in the household get more restful sleep.

Once you start sleep training, progress can take anything from a couple of days to several weeks or longer, depending on your baby’s readiness and the method you use.¹ Consistency and patience are key to its success.

When to start sleep training your infant

The general consensus for when to start sleep training is around 4-6 months.¹ This is because circadian rhythms, the body’s internal 24-hour clock, are still developing in early infancy and typically mature between 3 and 6 months.² Before this stage, younger babies may find it harder to follow consistent sleeping patterns and still rely heavily on feeding, comfort and parental cues to regulate their sleep-wake cycles.

Around 4 to 6 months, your little one may be ready to start sleep training. However, every baby develops differently, and some may need a little longer before they are ready. If you have any further questions about when should you start sleep training your infant, or any concerns about their sleep, feeding or development, speak to your doctor or paediatrician.

When can I start sleep training my newborn: Signs your baby is ready

Before you start sleep training, it’s important to look at more than age alone. Your baby may be showing signs of readiness. Useful signs to look for include¹:

• A more predictable bedtime rhythm. Your baby may be starting to recognise familiar sleep cues, such as a feed, cuddle, bath, story or quiet time before bed.
• Some ability to self-soothe. This might mean your baby can occasionally settle with less hands-on help, such as sucking their fingers, turning their head, or calming after a brief stir.
• Longer stretches between wakings. If your baby is beginning to sleep for longer periods overnight, it may suggest they are becoming more ready for a consistent sleep routine.
• Feeding and growth are progressing well. If your baby is feeding well, gaining weight as expected and has no health concerns, they may be better placed for changes to their sleep routine.
• Their sleep patterns are becoming more consistent. You may start to notice more regular naps, wake windows or night-time patterns, even if they are not perfect every day.

Every baby develops differently, so these signs should be used as a guide rather than a checklist. If you are unsure whether your baby is ready, or if you have any concerns about feeding, growth or development, speak to your health visitor, GP or pediatrician before making changes to their sleep routine.

How to start sleep training

• Confirm that they’re ready. Before you begin, check that your baby is showing signs of readiness, such as...
  • a more predictable bedtime rhythm
  • longer stretches between wakings
  • some ability to settle with less hands-on help.

It is also important that feeding and growth are progressing well, and that your baby is not unwell or going through a major change. If you are unsure, speak to your health visitor, GP or paediatrician before making changes to their sleep routine.

• Set up the sleep environment. Keep safer sleep guidance at the centre of your routine by placing your baby on their back in a clear, flat, firm and separate sleep space, with no loose bedding or soft toys.³ A calm, dark and comfortable room can also help signal that it is time for sleep.

Tip: The Philips Avent Premium Connected Baby Monitor uses SenseIQ to show your baby’s sleep status and breathing rate, helping you observe their sleep remotely. With ultra-clear vision by day or night, it can give parents extra reassurance while they keep an eye on their baby from another room. This can be especially helpful when you start sleep training, as it lets you monitor how your baby is settling while still giving them space to practice sleeping more independently.

• Create a consistent bedtime routine. A simple sleep schedule can help your baby understand that sleep is coming, especially when it happens in the same order each night. This might include a feed, nappy change, cuddle, story, lullaby or quiet time before being placed down to sleep. Try to keep the routine calm and manageable, so it feels realistic for everyone caring for your baby.

• Choose a sleep training method. Different families choose different approaches, from more gradual methods to more structured behavioural sleep techniques. Here are some examples:
  • Fading (camping out) method: A parent stays near the baby while they fall asleep, offering reassurance without too much hands-on soothing. Over several nights, the parent gradually moves farther away until the baby becomes more used to settling independently.
  • Ferber method: After a consistent bedtime routine, the baby is placed down to sleep, and the parent leaves the room. If the baby cries, the parent checks in at gradually increasing intervals to offer brief comfort before leaving again.
  • Check and console method: Parents check in regularly to offer calm reassurance, sometimes before the baby begins to cry. The time between check-ins is gradually increased as the baby becomes more settled.
  • Pick up / put down method: The baby is picked up and comforted when they cry, then placed back down once calm but still awake. This is repeated as needed to help them settle with reassurance.

The right method should feel safe, responsive, and appropriate for your baby’s age, feeding needs and temperament. If a method feels too stressful or does not fit your baby’s needs, it is okay to pause and seek professional guidance.

• Stay consistent. Sleep training often works best when all caregivers understand the plan and respond in a similar way each night. Progress may take a few days, several weeks or longer, so try to be patient and keep expectations realistic. If your baby becomes unwell or the approach no longer feels right, you can pause and return to it when things feel more settled.

When should I start sleep training: Signs your baby isn’t ready yet

It may be better to pause and seek individual advice if your baby's sleep and feeding still change considerably. Signs to consider include:

• Very short or highly variable sleep cycles that make a routine difficult to recognise.
• Your baby still needs regular night feeds and cannot comfortably make it through the night without feeding.
• Your baby cannot yet settle without substantial help, so opportunities to self-soothe are limited.
• Your baby is unwell, experiencing a major developmental change, or feeding is causing concern.

Sleep training FAQs

How early can you start sleep training?

You can usually start sleep training from around 4 to 6 months, once your baby’s sleep rhythms are becoming more predictable and they are feeding and growing well.¹,² Some babies may need longer, so it’s best to look for signs of readiness rather than relying on age alone.

Can I sleep train at 4 months, or should I wait longer?

There is not a universal yes-or-no answer. Sleep training can begin as early as 4 months,¹ however it’s essential that you take your baby's individual readiness signs, health and feeding needs into account before deciding.

Can I sleep train if my baby still wakes up for night feeds?

Night feeds can remain normal and necessary for babies, and sleep training should not mean ignoring hunger cues. If your baby still needs feeds overnight, respond to those needs and ask your health visitor or GP before making changes to night feeding.

Deciding when should you start sleep training is less about reaching one exact age and more about understanding your baby. Watch their sleep patterns, feeding needs and ability to settle, then choose a responsive approach you can follow consistently.

If you want to know how to start sleep training your infant, begin with a calm bedtime routine and professional advice where needed, while keeping safer sleep recommendations at the centre of every nap and night.

Sources 

¹Sleep Training for Babies, Sleep Foundation 

²Appropriate Lifelong Circadian Rhythms Are Established During Infancy: A Narrative Review, NIH 

³Safer sleep advice for babies, The Lullaby Trust