The 4 month sleep regression, the 12 month sleep regression, the 18 month sleep regression – what is happening?
Of course, any time your baby’s sleep suddenly seems to go pear shaped , you wonder what am I doing wrong?
The term ‘sleep regression’ sounds ‘scientific’ , as though the person advising you has done their homework about infant sleep. However, if your baby’s sleep has changed (doesn’t it change every week or so?), you don’t need to beat up on yourself that you must be doing something ‘wrong’ and you don’t need to anticipate ‘sleep regressions’ with dread.
Here’s the thing: your baby isn’t having a ‘regression’. Sleep isn’t a milestone – even though it certainly feels like an achievement when your baby starts snoozing for several hours at a stretch. By the way, ‘all night’ in infant sleep studies means five hours sleep in a row –not eight hours like an adult or twelve hours like some baby books will tell you.
The real, measurable, important milestones that signal your baby’s actual development can influence your baby’s sleep, or lack of it. So, when your well baby, who has been sleeping in peaceful blocks, suddenly starts waking more frequently, it often means he is approaching a real developmental milestone – he is not ‘regressing’, he is ‘progressing.’
Your baby may also be having a growth spurt and needing more frequent feeds to support this, but of course at any time your little one suddenly becomes unsettled or wakeful, it’s important to consider that there may be a health or medical reason for this: could your baby be’ coming down’ with a bug or perhaps an illness such as sore ears or a urinary tract infection (babies generally wake when they wee if they have a UTI because it hurts), or if your baby has recently started family foods she may be upset by food sensitivities.
Is baby reaching a developmental milestone?
Developmental milestones can be physical (rolling, crawling, cruising, walking), emotional (separation anxiety) and neurological (perceiving distance)
As babies approach any new developmental phase, their perception of the world changes. For instance, at around six months, your baby will start to perceive distance. This means that as you walk away, your little one is now more aware of the distance that separates you and he will yell at you because the increasing distance between you and him is confusing and a bit scary).
Although these milestones can be just a blip on the radar for some babies, more sensitive babies will need extra reassurance and can become quite clingy or generally unsettled at these times.
Because babies process information during their sleep – blood circulation to the brain almost doubles during REM sleep – it’s perfectly normal for them to wake more often as they are approaching new milestones. They may also go on feeding binges as their tiny brains are having a growth spurt, just as baby bodies have growth spurts.
For instance, at around four months (the four month sleep ‘regression’ that everyone is talking about), babies are becoming much more aware of the world – they are babbling (this is the beginning of language acquisition), exploring things with their mouth (soon that will include their feet too as they suck their toes), they are recognizing familiar people (and becoming anxious around strangers – separation anxiety is kicking in), many babies are starting to roll over so they wake because they have unintentionally rolled onto their belly and this has woken them. They are confused and upset because they really wanted to be sleeping but that tiny brain processing information has resulted in some extra ‘practice’ of their new skills. All of this adds up to a very busy little brain that finds it difficult to switch off.
At this age, babies may also be distracted when feeding during the day, so can often ‘reverse cycle’ and feed more effectively at night when stimulation is reduced and night milk has more ‘calming’ chemistry.
As well as often having difficulty getting to sleep in the first place or resettling after being woken by their busy brains and bodies, when he wakes confused, your baby will call for help from the most important person in his world – you.
Looking for gentle, respectful ways to help your baby (and you) sleep without compromising breastfeeding or the beautiful bond between you and your little one? See my book Sleeping Like a Baby (it’s available on Audible too, if you don’t have time to read). You can download the first chapter FREE HERE.
“I just want to thank you for your wonderful book (sleeping like a baby) – I read it in one day.
I was under a lot of pressure from family to sleep train using the CIO method and before even falling pregnant I hated the practice. I was told that I need parenting classes; that my baby won’t reach her milestones; that I’m spoiling her; that I’m creating further sleep issues; that my baby is ruling the roost; and that I’m “free range” parenting.
She is a very happy and thriving 9 month old. I still feed or cuddle her to sleep depending on what she needs and have continued to feed her overnight if she wants a feed. Sometimes she sleeps 12 hours, sometimes she is awake every hour and I’m happy to respond to her needs. Your book has given me the confidence to shrug off all the horrible advice that I’m given as a first time mum and to follow my own instincts. (Anna)
Once you have ruled out illness as a reason for sudden changes in your baby’s sleep patterns, consider your baby’s development: what new skills is your baby learning? Is she a bit more clingy during her awake times? Does she seem more sensitive right now? And try to see her wakefulness as a positive – she is not regressing, she is progressing.
Your baby is learning and developing in leaps and bounds. She isn’t waking because you have done anything wrong. You aren’t encouraging ‘bad habits’ you are helping your baby feel secure as she grows through these intense developmental stages. You don’t have to justify your baby’s behavior with fancy labels or reasons for her waking (except perhaps, to yourself if it makes you feel better).
The good news is that, as your baby masters each new milestone, there will be spells of sound sleep again – until the next developmental leap!
Pinky McKay is an International Board Certified Lactation Consultant, Mum of five and best selling author of Sleeping Like a Baby, 100 Ways to Calm the Crying, Parenting By Heart and Toddler Tactics.
“Tonight my husband commented “What have you done with my stressed 
out wife? She’s vanished.” So he thanks you too 🙂 Your book has been a
profound blessing.” Warmest regards Karen (mother of a three month old)
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