Skip to content

Your 45-week-old Baby’s Development & Growth

Table of Contents

45-week-old Baby

Table of Contents

Your 45-week-old baby is finally turning into a child who is more interested in eliciting reactions from the people around him. The little ones can now be able to drink out of their cup or hear and understand a big ‘NO’ out of you. But you must treat your baby’s crying, clinginess, and crankiness with love.

Perhaps, the little baby that once was hardly crawling across to you is now being pro at standing up and also walking independently. They can even clap and blow kisses to you.

This is also the tender age where the child can develop separation anxiety but also be stubbornly confident. They will also be able to point at colorful things in their books and grow chubby.

Read on to know more as to what you can expect out of the 45th weeker!

Your 45-week-old Baby's Development and Physical Growth: Weight, Sleep, and Diet

Let us now understand what happens with the little one in their 45 weeks after birth. To put simply, their weight, diet, and sleep patterns change and you need to make sure there are no fluctuations in them.


  • Expect your baby to weigh anything from around 19.4 lbs to 20.12 lbs. Nonetheless, if you observe the baby grow less or more, consult a doctor for help.


  • Babies at 45 weeks have quite a disturbed sleeping pattern, meaning the little one could spend more time drinking breast milk, also known as ‘breast sleeping’.
  • If you are in this situation, make sure to be supportive and ease any strain from the fixed position. You can switch your baby to the other side in the middle of the night to help you ease the position of your body for a night of better sleep.
  • The good news is that this period is only temporary as it is the baby’s developmental phase, and will return to the normal routine in a few days or a week, as per the need of the baby.


Your 45-week-old baby has almost completed a year, so you can start weaning your baby from breast milk, however, it is not a compulsion if you have the time. Breastfeeding can be done until 24 months as toddlers gain more nutrition and immunity from breastfeeding.

You can follow the steps below in lieu to reduce the intake of breastmilk in your baby:

  • Give your baby one feed when they wake up
  • Get them some breakfast
  • Allow your baby a mid-morning feed just before their naptime
  • Give the baby lunch and breastfeed as per their needs
  • A mid-afternoon feed just before their nap
  • Dinner and breastmilk
  • And last, at bedtime

You can also find a natural comforter for the babies to help take the baby bottle away from them, such as a pacifier. And, replace the breast milk with a natural formula.

Your 45-week-old Baby's Doctor Visit

A 45-week-old baby or eleven months old is acquiring major milestones and visiting the doctor for a check-up counts as one. Here’s what you can expect from the visit to the baby’s doctor:

●     Tests

In case your baby shows signs of anemia, the healthcare provider could advise a blood test. This will help check the levels of hemoglobin, iron, and lead.

●     Routine check-up

Expect the baby’s doctor to measure the little one’s height and weight in order to track their development.

●     Vaccination

Anytime between 6-18 months, your baby would require a final dose of the Hepatitis B vaccine, the third dose of the IPV (polio) vaccine, and depending on your baby’s health – an influenza vaccine shot.

Your 45-week-old Baby’s Developmental Changes

The 45-weeks-old baby is learning and developing gradually this week into the life of a toddler from a newborn. Therefore, the parents can expect a lot of changes in their baby that come in naturally. Perhaps, here are a few tips to help you stay aware of certain changes during this week:

Here are a few changes your growing baby will go through in the 45th week:

  • The toddler will now learn and grasp the concept of “NO,” from you. Perhaps, expect the baby to tease you at every chance she gets, and laugh it out in awe.
  • The 45-weekers might also learn to pass a mischievous grin as and when they do something wrong. This is more to get your attention than to be rebellious in nature.
  • They’ll like to play pretend on the phone just as you do, perhaps imitating talking to you over the phone.
  • Your baby might have also learned to shake their head and use single-syllable words.

Your 45-week-old Baby is Now Tantrum-ready!

Yes, the little sweet adorable kid is now capable of throwing tantrums, so be cautious and keep these expectations:

  • With their growing autonomy and still improving communication skills, don’t be shocked if your baby starts throwing mini temper tantrums when they wish to have something.
  • This is because your baby as an individual begins to grow their own personality, with some sensitive or high-babies needing that might result in a minor disruption.
  • However, do not adhere to your baby’s tantrums as this will only teach them that being loud can get them what they wish. On the other hand, you must leave your baby alone in their crib or room and make sure they know that it isn’t something worth a reward. Make sure your cribs are safe enough to leave your baby in them on their own. Get the best baby cribs here!

What Games Could You Play With Your 45-week-old Baby?

45 weeks and they are ever ready to be active with their unending energies. Get ready to play these games with your little ones!

●     Peekaboo/Hide and Seek

Play hide and seek with your baby in the house, but do not hide for too long. This helps your baby understand that even if they aren’t around you are always there, and also helps get over their separation anxiety. A word of caution, make sure your house is baby-proofed.

●     Tunnel

You can erect a play tunnel for your baby for them to crawl through and come out from the other end. Make sure you are not getting the little one trapped in a long-way tunnel as it leads them into fear.

●     Point Game

Ask your baby to point out things in a storybook and also name it. This will help the baby to learn new names and their visuals.

What to Expect as Parents With a 45-week-old Baby?

Here are a few tips for our parents to help them simplify their journey with their 45-week-old baby:

Understanding Your Baby's Health and The Urgent Need for a Doctor

Listed below are a few instances where parents must consult a doctor regarding their 45-week-old baby during this week:

  • In case you notice an abnormality in the way your baby walks, or is bowed, or has one knee is turned in. This could signal that the baby has rickets or any other condition. Consult your pediatrician for your baby in need of a diet rich in Vitamin D.
  • In case your baby hits itself on a sharp edge and you notice that your baby is in pain for a few days.

'Masks of Pregnancy' in Young Moms

Masks of pregnancy or a ‘Melasma’ is observed as dark brownish patches of discoloration due to the changes in the hormones during pregnancy. This can perhaps affect anyone in the form of hyperpigmentation and goes away post-childbirth.

However, there are cases where this is seen to have exacerbated due to the rays of the sun, therefore, you must then avoid any direct exposure to the sun and use a sunscreen of SPF 30 if required. On the other hand, make sure to visit a dermatologist to discuss these topical treatment options.

Note – Speaking of sunscreen, make sure to use some baby sunscreen on your baby too when you plan a playdate with them or a picnic. Also, install a toddler car seat to keep the baby safe.

A Final Word on a 45-week-old Baby’s Development

At 45 weeks, there are chances that the baby learns to grow on the wrong path while throwing tantrums at your baby. Perhaps, parents must make sure to not give in to it and let them know that it’s not ok for them to cry just to get what they need.

On the other hand, this week is different as compared to the other weeks as your little sweet baby now grows into an independent toddler. Check out their developmental milestones at a glance:

  • Your baby begins transitioning from the “laying flat on your stomach” position to a sitting position.
  • They will comprehend what “no” means but may not always comply with it.
  • Flexing their fingers and picking up items is another major achievement.
  • Your child will be able to mimic sounds and tones of voice.
  • They will also gesture along with basic commands like “bring me the ball” or “give me that.”
  • When you prompt, your infant will be able to respond with sounds. Like responding with a “moo” when asked, “What does the cow say?”
  • Along with “mama” and “papa,” your baby’s vocabulary may now include four or five words with different sounds.

45 weeks old means your baby is now 11 months of age, almost a year old. The first year of a baby’s life is filled with the achievement of basic movements, sounds, senses, and exploration. A 45-year-old baby will have your hands full with curiosity and giggles. Did you know that there is some hidden science behind babies giggling? Click here to learn more!

FAQs: Your 45-week-old Baby’s Development & Growth

1. How many months are a 45-week-old baby?

At 45 weeks, your baby is 11 months and two weeks old. Expect them to be comparatively independent and responsible with a good intake of solids.

2. What should a 45-week-old baby eat?

A 45-weeker can be expected to have a good intake of solids with breast milk. Here are the 9 best baby food you can introduce as solids:
  • Plum Organics Stage 2 Fruit and Veggie Pack
  • Happy Family
  • Mama Bear Organic Baby Food
  • Beech-Nut Organics
  • Little Spoon
  • Once Upon a Farm
  • Sweet Potato and Banana Organic Teethers
  • Gerber 2nd Chicken & Rice Foods
  • Happy Baby Puffs
  • 3. What can a baby at 45 weeks do?

    A 45-week-old baby can stand unsupportive, be aware of their surroundings, and can shake their head. They can also play games with you like hide and seek and will love exploring themselves. Make sure you spend at least half an hour with your baby to help them figure out things.

    On behalf of the editorial team at Parenthoodbliss, we follow strict reporting guidelines and only use credible sources, along with peer-reviewed studies, academic research institutions, and highly respected health organizations. To learn about how we maintain content accurate and up-to-date by reading our medical review and editorial policy.

    Share this Article

    Disclaimer: All content found on our website is published for informational and/or educational purposes only; not intended to serve or offer any form of professional/competent advice. We put in every effort to ensure that all information is just, accurate, fool-proof, useful, and updated but do not assume responsibility or liability, to loss or risk, personal or otherwise, incurred as a consequence of information provided. Parenthoodbliss may earn commissions from affiliate links in the content.

    Rectangle 22

    Did not find what you were looking for?

    Drop-in your request and we will be happy to write it down for you!