Why is my four-month-old waking again? Sleep changes explained

Just as you started to believe you had cracked it, the nights fell apart. Many parents of three to six month olds describe the same thing: longer stretches of sleep, followed by a sudden return to frequent waking, short naps and a baby who fights bedtime. Here are honest answers to the questions parents ask most in this stage.

What is happening to my baby's sleep?

Around three to four months, babies' sleep starts to mature. They move from the simpler newborn pattern towards sleep cycles more like an adult's, with lighter phases in between. Everyone wakes briefly between cycles. Babies who have not yet learned to settle back to sleep may wake fully and call for help.

At the same time, your baby is more alert and curious, practising new skills like rolling, and may be going through a growth spurt. Some may even practise rolling in the cot. Put all of that together and you have a baby whose sleep looks, for a while, like a step backwards.

Is this a "sleep regression"?

You will often hear the term. It can be a helpful label, but it is better to think of it as a sleep progression: a sign of development, not a problem you caused. For most babies it settles within a few weeks, especially with calm, consistent routines.

How much sleep does a baby this age need?

There is a wide range of normal. Many babies between three and six months sleep somewhere around 12 to 15 hours across 24 hours, including naps, but some need more and some less. Rather than chasing a number, look at your baby: are they mostly content and alert when awake? Many babies at this age still need one or more night feeds, and that is normal.

What can I do that actually helps?

• Start a simple bedtime routine. Bath or wash, clean nappy, sleepwear, a feed, a short song or prayer, then into the cot. The same order, every night, helps your baby recognise that sleep is coming.
• Daylight by day, dim by night. Open curtains and get outside during the day. Keep night feeds quiet and dim, with little talking.
• Watch for tired signs. Yawning, staring, rubbing eyes and fussing. An overtired baby often finds it harder to settle.
• Try putting your baby down drowsy but awake sometimes, so they get practice falling asleep in the cot. It is fine if this does not work every time.
• Pause briefly before going in. Some babies grumble between cycles and resettle on their own. If the cry builds, go to them.

Should I do sleep training?

Families have different views, and many babies are not ready for formal sleep training at this age. Responding to your baby at night is not spoiling them. If you are considering any method, talk it through with your health visitor or doctor, and choose something that fits your baby, your family and your conscience.

Safe sleep still matters

• Back to sleep for every sleep, in a clear cot with a firm, flat mattress.
• Room-share for at least the first six months.
• Stop swaddling once your baby shows signs of rolling.
• No pillows, bumpers, weighted sleep products or inclined sleepers.
• Never fall asleep with your baby on a sofa or armchair.

When should I talk to someone?

Ask your health visitor or doctor if your baby seems in pain, snores loudly or has pauses in breathing during sleep, is feeding poorly, or if the waking suddenly worsens along with signs of illness such as a fever. Seek urgent help if your baby has breathing difficulty, is floppy or very hard to wake.

And please speak up about yourself. Long-term broken sleep is hard on body and mind. If you feel constantly low, anxious, or unable to cope, tell your doctor, midwife or health visitor.

What about my rest?

Share nights if you can with your husband or partner, perhaps one person taking the early part of the night and the other the later part. If you are parenting alone, lean on family or friends for daytime help so you can nap. Lower your standards for the house this month. Your rest is not a luxury.

There is a quiet confidence in this verse that many parents have prayed at the cot side:

"I will both lay me down in peace, and sleep: for thou, LORD, only makest me dwell in safety." (Psalm 4:8, KJV)

Your baby's sleep may be unpredictable for a while. Your safety, and theirs, is held by Someone who never changes.

A prayer for broken nights

Lord, my nights are short and my patience is thin. Help my baby find rest, and help me rest whenever I can. Give me peace at three in the morning, and grace for the day that follows. I lay us both down in Your safety. Amen.