Hello My Baby!


A Guide to Items Suited for Babies Based on Monthly Age

Here we introduce clothing appropriate to a baby’s monthly age since a baby continuously grows. But just how do they change and grow over time? To help us find out, we’ve asked two experts, Dr. Youichi Sakakihara and Dr. Rikako Sasaki, for useful information and tips on selecting the right items of clothing during a newborn baby’s first year of growth. Dr. Youichi Sakakihara is extremely knowledgeable about children’s development and Dr. Rikako Sasaki is a dermatologist specializing in children’s skin.


A newborn child has dry skin.

“A baby’s skin is very dry. So, much so that it is said that a baby skin requires moisturizing from the moment they are born. The baby’s skin is also very susceptible to friction and other physical stimuli. So it is important to choose clothing that is made of smooth and soft fabrics.” (Dr. Sasaki)

For a baby’s sensitive skin, even the slightest scratchy or rough fabric becomes the cause of great stress and irritation. Therefore we made sure that the below styles can be washed many times while maintaining its comfort with softness. Its flat-stitched seams in delicate areas, such as the neck and armpits, is another one of their features, and so are ideal for helping babies sleep comfortably.


Testing out how the body functions by moving the hands and legs.

During this stage a baby spends time lying on its back and lifting their hands and feet against gravity.

“In a baby’s brain, signals are sent from the brain to its limbs in order for them to move. While the transmission speed of the signals in adults is 70 m/s, which is as fast as the Bullet Train, the transmission speed of the signals in babies is 10 m/s, which is as fast as a motorbike. Babies are learning their sense of movement by practicing while forming myelin, a substance that increases the speed of transmission – they are running a trial run, so to speak. And for this there is naturally no how-to manual; the baby learns through trial and error, simply by doing.” (Dr. Sakakihara)

Since this is precisely the stage where the baby starts to gradually move their hands and feet and practice how to move their limbs, it is even more important to choose clothing that is free and flexible so as not to impede the baby’s movements. Designed to open up in front, and efficiently change out the below outfits even while the baby is lying on their back.


Learns to roll over and sit upright, discovering a whole new world.

During this stage, the baby’s position shifts from lying on their back to laying on their stomach a lot. This is the stage where the baby starts crawling, allowing the baby to start looking farther and down on things from a somewhat higher position. It’s also during this time that the baby begins to roll over.

“Turning and rolling during sleep is the first form of physical activity in life that enables the baby to actually move and change position. By rolling around, the baby learns to repeat this movement and move to places they want to encounter new things.” (Dr. Sakakihara)

Furthermore, once the baby’s back becomes strong enough, squatting on the floor upright also becomes possible. “At this stage, the baby can see things from an even higher position, expanding their horizons and discovering a whole new world.” (Dr. Sakakihara)

For such activity, coveralls made of stretchy fabrics are recommended. It’s also during this period that the baby begins to be taken outdoors more, which is something a baby enjoys. Choosing items of clothing with a nice design allows it to be worn as regular everyday wear.


Both babies and adults have the same number of sweat glands.

“It is said that both babies and adults have the same number of sweat glands over the course of their entire lifetime. Since babies have much smaller body surface area compared to adults, they seem as though they are sweating a lot more than adults.” (Dr. Sasaki)

It may help to imagine soaking the same amount of water with a hand towel and a bath towel. The wetness of the two is and feels completely different when you touch them with your hands. Leaving sweaty clothes on the baby’s skin for extended periods of time can lead to heat rash and eczema. Choose a highly breathable cotton mesh bodysuit to help the sweat evaporate quickly for your baby’s everyday comfort.


After toddling, an infant gratifies their curiosity.

The biggest step for 12-month-old babies is when they start walking by themselves.

“Although most adults are seven heads tall, infants are only four heads tall with short legs, trying to balance their weight. The ratio of the weight of an infant’s head to their body weight is quite high, which means that the weight that an infant supports is many times heavier than that of an adult when walking.” (Dr. Sakakihara)

Our leggings have been created with the intention of caring for the unsteady walking, and they are made of materials that have good elasticity. The bloomers have rubber in the areas of the waist and thigh, keeping them in their place and making it easy for a baby to move. “A baby becomes curious when they walk on their own and increases their living space drastically. It’s a moment all parents are waiting for and makes them look forward to their child’s further growth.”(Dr. Sakakihara)


Yoichi Sakakihara
Faculty of Medicine, The University of Tokyo.
M.D., Ph.D.

Specialized in pediatric neurology, developmental neurology, attention deficit hyperactivity disorder (ADHD) in particular, Asperger syndrome and other developmental disorders, and neuroscience

Rikako Sasaki
Nippon Medical School
M.D., Ph.D.

Specializing in Pediatric Dermatology, she has published numerous books and publications on the topics of atopic dermatitis and allergies in infants and skin care.


tips on dressing your baby

Tips from experienced parents on how you should dress a newborn baby

Learning how to choose appropriate clothing for a baby is a whole new experience for expectant first-time parents and always bit of a challenge. With the help of experienced moms and dads and their useful insights, we’ve come up with some helpful tips on how you can dress newborn babies so that they can spend each day comfortably.

Parent recommendations

Feedback from experienced parents who usually use UNIQLO’s line of babywear and what they like about it.

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I’m glad that the texture feels good, and it’s easy to put it on my baby. The baby looks so comfortable, and it feels soft when I carry the baby on my arms.

I have to change and wash the baby’s clothes many times a day because of vomiting, so it’s really nice that it doesn’t shrink or lose its shape after washing.

The snap buttons are colored differently and helps prevent me from getting the buttons all wrongly aligned. This helps a lot in getting my baby dressed quickly after a bath.

It is so handy because my baby doesn’t feel any discomfort when wearing it due to its flat sewing.

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UNIQLO thought about how to get babies and their caretakers to have comfortable daily lives with our clothes.

snap button detail

The easy-to-use plastic snap buttons prevent any danger arising from possible metal allergies. Each button pair is colored differently, helping moms not to attach the buttons in the wrong spots.

flat seam detail

Intentionally designed with flat seams on the neck and underarms that come in direct contact with the baby’s skin, you don’t have to worry about the newborn baby’s sensitive skin being irritated by the fabric.

snapper detail

The snap fasteners located close to the chest can be easily attached and taken off and prevents any twisting and shifting of the fabric.


We’ve compiled a list of newborn essentials according to their growth and development. The handy checklist can help you determine what items you need at the right moment.






Milled Linen Coverall /  Waffle Cotton Coverall



Mesh Bodysuit

AIRism Mesh Bodysuit

Cotton Mesh

Cottom  Mesh Bodysuit



Crew Neck T-Shirt

Crew Neck T-Shirt

UV Protection Styles

UV Protection Styles


0 Months

0 Months

Sleepy time

3 Months

3 Months

Holds the head up / grabs objects

6 Months

6 Months

Gets into a sitting position / sits unsupported

9 Months

9 Months

Crawls / pulls itself up

12 Months

12 Months

Starts standing