Baby is 1 month old: the first four weeks.
A month has already passed since you met. Your newborn is slowly leaving the infant phase to open up to the world. Between primitive reflexes and intense first glances, discover how to support this pivotal stage.
A time of adjustment
At 1 month, your baby is no longer quite the same as during their first days. Their features are refining, their movements are loosening slightly, and they are beginning to establish their own form of communication. It is a period of intense transition for both child and parents, where the rigor of care meets the magic of the first conscious interactions.
This guide was designed to give you a panoramic and scientific view of this 4th week of life, addressing both physiology and deep emotional needs.
Physical portrait and motor skills
Your baby's body at 1 month is still marked by axial hypotonia (the trunk is soft) contrasting with limb hypertonia (the arms and legs are often folded and toned).
- Head support: While they can't hold it on their own yet, they are beginning to be able to lift it for a few seconds when on their stomach.
- Reflexes: They are still very present. The Moro reflex (startle), grasping, or sucking are signs of a healthy neurological system. Explore our dossier on primitive reflexes to learn more.
- Skin evolution: Baby acne may appear around 3 or 4 weeks; it is a completely normal and temporary hormonal phenomenon.
The physical portrait of the newborn continues to evolve: their head circumference increases significantly this month, a sign of rapid brain growth.
1-month-old rhythm simulator
Understand the alternation between active sleep, quiet sleep, and wakeful phases.
Click on a category to discover specificities at 1 month.
Sensory awakening: a world in technicolor
Vision
At 1 month, visual acuity is still low. Baby sees clearly at a distance of 20 to 30 cm, which is exactly the distance between your face and theirs during feeding or changing.
ADVICE: Prioritize strong contrasts (black and white) and human faces.
Hearing
Your child already perfectly recognizes your voice. They are sensitive to high-pitched sounds and soft melodies. They can even turn their head toward a sound source they identify.
The famous "Angel Smile"
This little lip movement you observe during their sleep is not yet a social smile (which will arrive around 5-6 weeks). It is a physiological reflex of well-being. It is one of the first signals of soothing that baby sends to you.
Learn more about their senses
Sleep: Rhythms and Safety
At 1 month, baby does not yet distinguish day from night. Their biological clock is in the process of setting. Their sleep cycles last about 50 to 60 minutes.
Quantity:
Between 14 and 20 hours per 24 hours.
Environment:
Room at 18-19°C, suitable sleep sack, lying flat on back.
Respecting rituals helps with the transition. Consult our advice on newborn rhythms.
Feeding and Digestive Well-being
● Breastfeeding
Breastfeeding is always on demand. At 1 month, the baby may ask for between 8 and 12 feedings per day. It is the law of supply and demand that regulates your production.
Be attentive to early signs of hunger: baby turns their head, tries to suck on their hands, makes sucking sounds.
● Bottle-feeding
Volumes often stabilize around 90ml to 120ml per feeding, about 6 times a day, but every child is unique. Never force a baby to finish their bottle.
Ensure proper preparation: one level scoop of powder for every 30ml of low-mineral water.
The challenge of colic
Around 3 or 4 weeks, many parents face "evening crying" often attributed to colic. Although stressful, this crying is common. Gentle abdominal massages, in a clockwise direction, can help relieve your little one's gas discomfort.
Explore massage techniquesBaby's health at 4 weeks
The first-month visit to the pediatrician or general practitioner is a crucial step. It is the time to review growth and ask all your questions.
Checkpoints:
- ✅ Weight & Height
- ✅ Head circumference
- ✅ Muscle tone
- ✅ Hip examination
Don't forget the daily administration of vitamins K and D (according to your practitioner's recommendations) and check that the healing of the umbilical cord is perfect. Find the details of the first medical appointments on our Birth check-ups page.
The attachment bond
At 1 month, baby is a real emotional sponge. They recognize their mother's scent and their father's voice. Physical contact (skin-to-skin, babywearing) is essential to regulate their stress and promote their cognitive development.
Talk to them
Even if they don't understand the words, they understand the intention and the melody.
Cuddle without moderation
You don't "give bad habits" to a 1-month-old baby by holding them.
Sing
The vibrations of your voice are extremely reassuring.
"The bond you weave today is the foundation of their future confidence."
Deepen the attachment theoryFrequently Asked Questions (1 month)
Is it normal for my baby to still be cross-eyed? ▼
Yes, it's completely normal. Eye muscle coordination is not yet perfect at 1 month. A slight intermittent strabismus is common and usually disappears around 3 or 4 months.
Baby cries a lot in the evening, what should I do? ▼
This "period of purple crying" or discharge crying is common between 3 and 6 weeks. Stay calm, practice skin-to-skin or babywearing. If you feel overwhelmed, don't hesitate to pass the baton or put baby safely in their bed for a moment to catch your breath.
Can I start playing small games? ▼
Awakening at 1 month involves simple gestures: showing them colorful objects at 20cm, making gentle funny faces, or shaking a rattle very softly. Excessive stimulation can tire baby; observe their signs of fatigue (avoiding eye contact, crying).
Almost two months old...
Development is accelerating. Prepare for the first real intentional smiles and greater muscle tone.
Discover the next step (2-3 months)