One-Month-Old Baby’s Growth And Developmental Milestones

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When you observe one-month-old babies’ milestones in terms of development, you will notice how a whole new world unlocks for them at this age. They develop new abilities and are more responsive, physically dexterous, and cognitively capable than when they were born. So, at the age of one month, what other developmental milestones could you expect from your baby?

Continue reading to learn more about the developmental milestones of a one-month-old infant, when to be concerned about developmental delays, and some tips to help parents aid in their development.

In This Article

One-Month-Old Baby’s Milestones Chart

Achieved Developmental MilestonesEmerging Developmental Milestones
Eyes can track objects from mid-line to the sideWill track moving objects from side to side
Can lock an object that is placed in the handAttempts to swipe and hit objects within reach
Grips objects but cannot hold them in handWill hold objects for a brief period
Notices faces and people within rangeBegins to notice their hands and legs
Makes throaty soundsStarts making cooing sounds
Stops crying when held by a caregiverWill stop crying at the sight of the caregiver
Displays all neonatal reflexesNeonatal reflexes gradually disappear
Lifts head a bit during tummy timeCan lift head by 45º during tummy time
Stops crying and looks in the direction of sound or voiceWill respond to the primary caregiver’s voice with coos and throaty sounds
Moves limbs symmetrically, with very little cognizance of themWill gradually learn that hands and legs are an extension of the body
Will recognize the mother’s breast but may not tell a bottle apartCan differentiate between breast and bottle

A One-Month-Old Baby’s Developmental Milestones

There are three primary areas of development: cognitive, physical, social & emotional, with unique developmental milestones in each category.

Cognitive developmental milestones

Expects feeds at set intervals
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Image: IStock

  1. Expects feeds at set intervals: Initially, the baby feeds any time you feed them. But when they are a month old, their body starts working by the clock, a cycle develops and they cry at specific intervals or when they are hungry. That is perhaps why babies usually cry at the same time each day, expecting a feed.
  1. Can distinguish tastes: A one-month-old baby will only have breast milk. Still, they notice changes in the taste of the milk when the mother eats something that could alter the taste or flavor of the milk in some way. The baby also seems to recognize the smell of breast milk (1). And know the difference between breast milk and bottle milk.
  1. Acknowledges the presence of an object or person: Hold an object close to the baby’s eyes, and you’ll find them looking at the object and maintaining eye-contact with it, thus recognizing its presence. Eye contact is extremely important.
  1. A memory of sensations and smells: The baby can differentiate a softer item from a rough, coarse one. They will display aversion towards contact with hard and rough items. There is also a preference for sweet smells and discomfort when exposed to bitter or harsh smells.
protip_icon Did you know?
One-month old babies prefer sweet smells and are irritated by bitter or acrid smells (1).

Physical milestones

Can thrust arms, One-month-old baby milestones
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Image: IStock

  1. Can thrust arms: Thrust arms forward albeit with a jerky movement. It indicates improvement in muscle tone.
  1. Moves the limbs a lot: A one-month-old baby will move the limbs symmetrically, meaning that one limb will move the same way as another.
  1. Improved reach: You will notice that the baby can bring their hand to their mouth and eyes.
  1. Head flops backward when unsupported: The baby cannot yet support its head, so leaving the head unsupported when holding them in your arms or placing them in your lap can make it wobble backward. While this is not an achievement, it is an indicator of the healthy growth of the baby.
  1. Can raise or sway the head: Place the baby on the tummy, and they will engage in activities such as lifting head and swaying it from side to side. A one-month-old baby has better neck dexterity due to developed muscles and nervous system.
  1. Rolls hands into a tight fist: Your little one can roll the hand into a fist at will.
protip_icon Trivia
One-month-old babies can move their heads from side to side while lying on their backs  (1).
  1. Grasp objects: Place an object in the baby’s palm, and they gradually roll their fingers around it and try grasping it. They also try to grasp nearby objects on their own (2).
One-month-old babies can grasp objects
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Image: IStock

  1. Eyes can track objects: When you bring an object to the baby’s side and slowly move it towards the center (midline), the baby will be able to track the object. The same thing happens when you place the object in the center and gradually move it to the side. The eyes follow the object.
  1. Can focus on objects that are up to 12 inches away: The baby can focus on objects and recognize faces at a distance of 8-12in (20.3 to 30.4cm) away.
  1. Sleeping time decreases by half-an-hour: The number of sleeping hours decreases from 16 to 15.5 in a day. The baby will sleep nearly the same amount of time during the day and night (3). The sleep pattern remains the same.
  1. Presence of strong neonatal reflexes: Babies display a plethora of reflexes at birth, which persist at the age of one month (4). Your baby’s pediatrician will look for these reflexes during a regular developmental check-up. The absence of these reflexes can be an indicator of developmental delay. These include the Moro’s reflexiXA protective response in infants to sudden stimulation or disruption of body balance. , the rooting reflexiXA reflex where babies open their mouth with their tongue thrusting when it is touched or stroked. , the sucking reflex and the stepping reflexiXA reflex when your baby appears to take steps when held upright in the air or on ground. .
protip_icon Do remember
Premature babies can have difficulty latching and sucking as their sucking reflex is not fully developed (4).

Social & emotional milestones

  1. Cries to communicate: The baby uses crying and cooing as a medium to communicate their pain and discomfort. They tend to stop crying the moment a caregiver holds them and addresses their need. So, if the mother picks a crying baby and breastfeeds him/her, then they calm down right away. They may even try smiling softly at this point.
  1. Recognizes sounds and voices: The baby has a memory of voices and recognizes familiar sounds and voices. They turn their heads towards the source. Babies also begin to make throaty noises at this age.

At one month old, babies are thought to have the ability to distinguish their parents’ voices which becomes apparent through their responses. Ginny, mother of two daughters and a certified teacher, talks about the one-month old developmental milestones drawing from her experience with her daughter Mina in her YouTube channel Ginny the EdD. She says, “For Mina, it tends to help when she hears one of our voices – mine or my husband’s – to calm down when she has those colic episodes (i).”

  1. Makes eye contact: Stand close to the one-month-old baby and they will look straight at your face and then into your eyes. The babies at this age are adept at making eye contact when a face is within the field of vision.
  1. Prefers human faces: A baby’s gaze will first settle on a face, even in the presence of several brightly colored items within their field of vision. This one-month-old baby’s developmental milestones work in tandem with the baby’s new-found ability to acknowledge a person’s eyes.
  1. Can sense and react to rough handling: If you handle the baby roughly, then they are quite likely to make their dissent clear. Despite being a month old, babies can differentiate between gentle rocking and movements that are deliberately rough and abrupt. They enjoy being rocked gently (5).

The above milestones and abilities of babies indicate healthy growth. Some red flags in the baby’s development could offset the ideal benchmarks. More about them next.

When To Be Concerned About The Baby’s Development?

According to the American Academy of Pediatrics (AAP), the following signs indicate a developmental delay in a one-month-old baby:

  1. Feeds poorly with weak latch and suction. Basically, difficulty in sucking.
  2. Does not focus on a nearby object even when you move it from side to side.
  3. Does not blink eyes or moves face away when shown a bright light.
  4. Does not respond to sound or voices even when awake and fully alert.
  5. The baby’s body and muscles seem stiff. Limbs barely move.
  6. The body feels floppy when you pick the baby in your arms. You sense nearly no muscle control.
  7. There is a trembling movement in the lower jaw, even when the baby stays still.

The US Center for Disease Control and the AAP recommend regularly screening of the baby for developmental delays (6). The baby should be seen by a pediatrician for regular development milestones. As some points might be missed by the parent. If you feel something amiss in the baby’s health, then do not hesitate to raise the topic the next time you see the pediatrician.

That said, parents can also contribute positively to the baby’s development at this stage.

How Can Parents Help In The Development Of A One-month-old?

Here is what you can do to facilitate the healthy growth of your baby:

  1. Tummy time: Allowing your baby to spend a fixed time every day on their tummy helps strengthen nearly all muscles of their body. Pediatricians recommend placing the baby on its tummy around three to five times a day, with each tummy time session lasting two to three minutes, eventually increasing the duration as they grow. This also helps in neck holding (7). Place an interesting object or toy in front of them to make this activity interesting.
protip_icon Quick tip
Tummy time offers various benefits for the baby. It aids digestion and prevents the formation of a flat spot at the back of the head. Start with a short duration and turn the baby over when they seem uncomfortable. Slowly increase the timing to 3-5 minutes (9).
  1. Indulge in activities that stimulate: Fun games and activities such as tracking objects can enhance the baby’s skills. Set some amount of time for activities each day so that your baby has adequate practice to enhance their developmental abilities.
  1. Social interactions are essential: Social interaction from early on in life helps forge the essential skills that are useful later in life. A healthy dose of interaction with caregivers and family members also ensures positive development in each area of the baby’s growth (8).

Frequently Asked Questions

1. Is it normal for a one-month-old to be fussy or colicky?

Yes, babies are generally observed to be cranky or fussy throughout the first three months. A baby’s colic does not indicate that the baby is sick. Colic eventually goes away by itself with time (10).

2. How often should I take my one-month-old for check-ups with their pediatrician?

The status of your baby’s health will influence how frequently you need to see the pediatrician. However, babies are frequently examined monthly for routine care during the first few months.

3. What not to do with a 1-month-old baby?

When caring for a 1-month-old baby, there are certain things you should avoid to ensure their safety, health, and well-being. Never shake a baby; it can cause severe brain injury or death. Always handle your baby gently and support their head and neck properly. Do not carry hot liquid or beverages with the baby in your arms. Placing your baby on a firm mattress without any pillows, blankets, stuffed animals, or soft bedding is recommended for safe sleep. Smoking near your baby or exposing them to secondhand smoke increases the risk of respiratory infections, SIDS (Sudden Infant Death Syndrome), and other health issues (11).

4. How much should a 1-month-old weigh?

On average, newborns typically gain weight at a daily rate of around 2/3 of an ounce (20-30 grams), and by the time they reach one month old, they weigh approximately ten pounds (4.5 kg). During this first month, their length increases by about 1 1/2 to 2 inches (4.5 to 5 cm). Generally, boys tend to have slightly higher weights than girls, with a difference of less than 1 pound or approximately 350 grams (12).

5. How long should a 1-month-old sleep?

A one-month-old baby needs about 14 to 17 hours of sleep daily. However, it’s important to note that every baby is different, and their sleep patterns vary. Some babies may sleep longer, while others may have shorter sleep cycles and wake up more frequently for feeding and diaper changes (13).

While a one-month-old baby is too little, you will be surprised to know their learning capabilities. They develop at a rapid pace and achieve many milestones. Feeding at regular intervals, distinguishing between tastes, being able to move their limbs and roll their hands to make a tight fist are some of the many milestones they achieve by the end of the one-month mark. However, know that every baby is unique and reaches its milestones at its own pace. If you are concerned about any delay, do not panic but contact your healthcare provider.

Infographic: Signs Of Concern In The Development Of A One-Month-Old Baby

While each baby develops at their own pace, especially a premature baby or a low-birth-weight baby takes longer. However, knowing the warning signs about the baby’s development can help parents to take proper measures and medical attention. Check out the infographic below to learn about these signs in a one-month-old baby.

possible signs of developmental delay in a one month old baby (infographic)

Illustration: Momjunction Design Team

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Key Pointers

  • One-month-old babies are capable of distinguishing different tastes and acknowledging the presence of others.
  • They communicate through crying, can recognize voices, and attempt to make eye contact.
  • If a baby fails to properly latch, blink at bright lights, or track objects, it is recommended to consult a pediatrician.
  • Tummy time and social interactions are beneficial for a baby’s development during this month.
One-Month-Old Babies' Milestones_illustration

Image: Dall·E/MomJunction Design Team

As a parent you must be worried about your infants’ healthy physical development. This video will help you learn about the milestones your one month old baby can reach and how to measure their growth.

Personal Experience: Source


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.

1. Developmental Milestones: 1 Month; American Academy of Pediatrics (2009)
2. Developmental Milestones: Fine Motor Skills and Visual Motor Skills; Children’s Hospital of Orange County
3. Infant Sleep; Children’s Hospital of Philadelphia
4. Newborn Reflexes; University of Rochester Medical Center
5. Developmental Milestones: Birth to 12 Months; University Of Pittsburgh
6. Developmental Monitoring and Screening for Health Professionals; U.S. Department of Health & Human Services
7. Back to Sleep, Tummy to Play; American Academy of Pediatrics (2017)
8. 8 Things to Remember about Child Development; Center on the Developing Child at Harvard University
9. Babies Need Tummy Time!; Eunice Kennedy Shriver National Institute of Child Health and Human Development
10. Colic; Nemours
11. Infants (0-1 year of age); Centers for Disease Control and Prevention
12. First Month: Physical Appearance and Growth; Healthy Children
13. Sleep Needs Across The Lifespan; Sleep Health Foundation

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