52 Week Old Baby | Your Baby Week By Week

52 Week Old Baby | Your Baby Week By Week

Your 52 Week Old Baby

Your 52 week old baby is twelve months old.

Happy Birthday to your baby! One whole year has passed since he was born!

And happy birthing day to you, amazing human.

In the first instalment of this series, we set out to describe what you could expect to happen each week in the first year, as your baby moved from helpless infant to burgeoning toddler.

From feeding and sleeping, to leaps and milestones, we have followed the typical development of a human baby.

Of course, each baby is a unique individual.

Your baby will have travelled this journey at his own speed – perhaps faster at some stages, and slower during others.

At times, you may have experienced stages which were not as described on the tin!

At other times it might have seemed we were talking about your own baby in detail.

So now – 52 weeks and 52 articles later – with leftover birthday cake tempting you, your baby is about to move into the second year of life.

Let’s take one more look at the journey he made to arrive here.

Feeding Your 52 Week Old Baby

If he was born in Australia, your baby was 96% likely to have been breastfed initially.

At 12 months, only 28% of babies are still receiving breastmilk.

The Australian Dietary Guidelines and the World Health Organization recommend breastfeeding until around six months.

However, there’s only a 15% chance your baby reached his half year without having some formula, or starting solids prematurely.

Now he is 12 months old, you’re encouraged to wean your baby from bottles and infant formula.

Yet research has shown as many as 40% of toddlers are having bottles at two years old, even though there are concerns regarding dental caries and extended bottle feeding.

World-wide sales of toddler formula are growing at an alarming rate, despite it being recognised as unnecessary.

Your new toddler should now be eating a wide range of family foods, and milk has become his secondary source of nutrition.

If your baby is one of the 9% still being breastfed at 18 months, or the 5% still breastfeeding at the World Health Organization’s minimum of two years, he will be getting as much as 29% of his daily energy needs from breastfeeds each day.

Sleep and Settling

Research shows that despite promises and expectations along the way, it’s unlikely your baby has been regularly sleeping for long stretches overnight.

One study investigating infant sleep duration found that 27% of babies had not regularly slept from 10pm to 6am by the age of 1 year.

And 13% of babies had not regularly slept through for 5 hours or more by the age of 1 year.

By far, one of the biggest interruptions to infant sleep in the second six months is crawling development.

Researchers have found sleep disruption in the month before crawling, and for as long as three months after that milestone is reached, is typical.

In the past 52 weeks, your baby has experienced ten developmental Leaps, commonly known as Wonder Weeks.

The total number of weeks referred to as ‘fussy periods’ in this past year is around 23!

If you feel like there is very little calm between the storms – you are right!

These mental developmental leaps are additional to the physical growth spurts and mobility progress that can also interfere with infant sleep.

And then there are teeth. On average, a 12 month old has eight primary teeth – four central incisors and four lateral incisors – around his first birthday.

Still to come before the next birthday are another eight teeth – four one-year-old molars, and four canine or ‘eye’ teeth.

Teething discomfort is also a common reason for your baby’s poor or interrupted sleep in the first and second years.

Play and Development

There is a 50% likelihood your baby has taken his first steps by his first birthday.

This is the culmination of the development of his central nervous system, from the top down.

He has progressed from rolling from his front to his back (around 3 months), then from his back to his front (around 5-6 months).

Your baby will have moved by crawling in some manner – commando style, bottom shuffling and/or hands and knees (around six to ten months).

Then he progressed to:

  • Sitting independently (around four to six months)
  • Supported standing (around six to nine months)
  • Independent standing (around 11 months)
  • First steps (around 9-12 months).

Eventually, there’s independent walking (around 14 – 16 months).

Your 12 Month Old’s Brain

Your 12 month old baby has also learned to control his body parts.

He has developed both gross motor skills (like those listed above), and fine motor skills (like picking up blueberries between his thumb and forefinger).

His hearing and sight have undergone fine tuning. Foundations for speech and language have also been laid down.

He’s developed awareness that he is separate from his mother.

He knows objects and people continue to exist, even when he cannot see them.

Your 12 month old baby understands around 25 words, and can respond to simple instructions. And he knows and recognises his favourite things and places.

Even so, his brain has barely begun to develop! It won’t be fully mature until he’s around 25 years of age.

As parents, your first year of life with your first baby is a huge transition.

Your life has changed in ways you might never have imagined.

Today, the celebrations for your baby’s first birthday are also a celebration of your journey as new parents.

And now the journey continues – into toddlerhood! Congratulations on reaching a year of parenthood – it’s quite the accomplishment.

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Yvette O'Dowd has been a breastfeeding counsellor and educator since 1992. She has three adult children and a two year old granddaughter - the best sort of bonus baby! Yvette runs a popular natural parenting network, is a babywearing educator, and runs antenatal breastfeeding classes for parents expecting twins and more! She is a keen photographer and scrap-booker and a keeper of a fairy garden.


  1. We have read your week-by-week articles every Saturday since the first few weeks that we were home with our daughter! We are first-time parents and we want to thank you so much for your kind guidance and excellent advice.

  2. Thank you very much for the effort you’ve put into this week by week guidance. During the past year I found myself keep coming back to it every week for a source of knowledge, enlightenment and reassurance. So sad it has come to an end.

  3. Thanks for this guide – it’s so gentle and responsive and reassuring! Found it very useful every week – wish we had a toddler version!

  4. I don’t have a baby – in fact, I’m writing a fanfiction that has one as a character. This guide has been a total blessing. Thank you so much for your help. I only wish we had a toddler version of it, or at least continuing it until Week 76 – the final wonder week, as far as I’m aware. Or, a month-by-month guide instead?

  5. All the way from France I wish to Thank you so much for your guidance Yvette, it has definitely helped me a lot to understand my baby (even though she’s my second one) and also helped me to trust my inner mummy instinct even when the world was telling me
    I might have been doing it wrong! Merci beaucoup!!

  6. Hi Yvette,
    I am so sad I won’t have any more week by week articles to read from you for my son 🙁 They have been a huge help for my husband and I to understand our lil man as he’s grown through his first year.
    Thank you for providing this website full of information that actually helps and makes a difference with a baby (as opposed to what else is out there).
    Don’t ever stop it, the world needs this out there for all us mums whether first time or not. I wish I could give you a big hug in thanks! ❤️

  7. This is by far my favourite baby blog and has been such an asset over the past year. You are right, sometimes it was like you were talking about my baby it was so accurate! Thank you so much.

  8. Thank you for this site! I have loved my weekly checkins and as a first time parent your articles helped me through so much. I looked at other baby development sites but always came back to yours because the amount of detail, knowledge, and care far surpasses the rest. My daughter is turning 1 and I wish I had more of your guidance for the next few months! Thanks!

  9. Hi Yvette,

    I’m from Ireland. Your emails were by far my favourite source of information, guidance and support. I found your articles to be do helpful and so insightful to us especially as first time anxious parents. You are a blessing. Thank you. Don’t stop!

  10. I can’t tell you enough how much I valued the week by week support, it saved me every time I thought ‘I can’t do this’! being a first time mum with no close family support is harder than I ever realised and your kind, honest knowledge and guidance was such a comfort and so reassuring when everyone around me was intent on sleep training etc. I know I’m a better mum for having you by my side, I will miss it so much. Thank you, thank you xx

  11. Thank you so much for this weekly articles.It guided me all through,so helpful.It’s sad we have come to end but i will surely follow you on your other articles.Thank you.

  12. Thank you so much for the weekly articles, they have been so insightful and helped us as parents to be more aware of our baby’s transition and growth. We are extremely sad that our journey ends here but we will treasure all the teachings for our second baby. Keep on doing the incredible work… God Bless!

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