Highlights
- By the second week, a baby already differs noticeably from the newborn of the first days
- The baby begins to recognize the mother’s voice and search for her face
- Vision remains close-range, while interest in faces and contrast increases
- Feeding becomes more efficient and intervals may lengthen slightly
- This is the most common period for the onset of infant colic
In This Article
- General adaptation in week two
- Physiology and sensory development
- Vision and eye coordination
- Why newborns have more bones than adults
- What a baby can do
- Sleep and feeding patterns
- Infant colic
- What actually helps with colic
General Adaptation in Week Two
A two-week-old baby already differs noticeably from the tiny newborn you brought home from the hospital. These changes may not be obvious at first glance, but they are real and meaningful.
Crying remains the baby’s primary way of communicating with the outside world. At the same time, parents communicate with the baby through their voice, touch, and physical closeness. By the second week of life, many babies can already recognize their mother’s voice, distinguish it from other sounds, and actively try to locate her face.
Physiology and Sensory Development
By the second week of life, most babies regain the weight lost during the first week. By the end of the second week, physiological newborn jaundice usually resolves.
Newborns are born nearsighted. A two-week-old baby can clearly see objects only at a distance of about 20–25 cm. This is exactly the distance to a parent’s face during feeding.
Do not be surprised if your baby does not make direct eye contact. At this age, babies are often more interested in eyebrows, hair, or a moving mouth than in the eyes themselves.
Vision and Eye Coordination
During the first month of life, babies actively learn to recognize faces. Research shows that infants prefer human faces over patterns or colors. High-contrast black-and-white patterns rank second in visual interest.
Temporary crossed eyes or a wandering gaze are normal at this age and are related to the physiological weakness of the eye muscles. As the baby grows, eye coordination improves naturally.
A simple exercise that supports visual focusing is gently moving your head from side to side during feeding or interaction and observing whether the baby’s eyes follow the movement.
Babies are also sensitive to light and can perceive depth. You may notice your baby blinking when an object is brought close to the face.
Why Newborns Have More Bones Than Adults
A two-week-old baby has approximately 300 bones, while an adult has 206. This difference exists because many bones gradually fuse together during the process of ossification.
For example, the bones of the skull in newborns are separate plates that slowly fuse over the first years of life. This structure allows for brain growth and flexibility during birth.
What a Baby Can Do
By the second week of life, the baby has begun to adapt to the surrounding world. The baby starts paying more attention to new sensations and stimuli.
When the baby becomes unsettled, a ringing toy may briefly attract attention. The baby often calms more easily when hearing the mother’s voice or a gentle song.
The baby begins to notice bright toys and can follow smooth movements of objects placed close to the eyes. Color perception is still limited, but movement is increasingly engaging.
Gentle rocking or walking while holding the baby introduces new sensations of movement. This serves as early training for the vestibular system, which later supports balance, crawling, walking, and more complex movements.
Sleep and Feeding Patterns
By two weeks of age, babies usually eat more actively and for longer periods than immediately after birth. The stomach capacity increases approximately 10–15 times compared to the first days of life and about twice compared to the first week.
At this age, the stomach capacity is approximately 80–130 ml. As a result, babies may ask to feed less frequently than before.
Average feeding intervals are about 1.5–2 hours during the day and 3–4 hours at night.
Some babies may already sleep for up to six hours at night without waking. However, breastfeeding mothers are encouraged to maintain at least one nighttime feeding, usually between 2 and 4 a.m., as prolactin production is highest during these hours.
Wakeful periods increase and may last around 30–40 minutes. This is an ideal time for interaction, bonding, and gentle play.
Infant Colic
The second week after birth is the most common time for the onset of infant colic in full-term babies. In preterm infants, colic may begin slightly later.
Colic occurs in approximately 20–25% of babies and does not depend on the type of feeding. Studies have found no difference in the occurrence of colic among breastfed, formula-fed, or mixed-fed infants.
The so-called Rule of Threes is often used to describe infant colic. Colic is likely if the condition:
- begins within the first three weeks of life
- lasts three hours or more per day
- occurs at least three days per week
- continues for at least three weeks
- resolves around three months of age
Between crying episodes, the baby appears healthy and behaves normally. Colic episodes can occur at any time of day but most commonly appear in the evening, from around 6 p.m. until midnight.
What Actually Helps With Colic
The exact causes of infant colic are unknown. Factors may include nervous system immaturity, air swallowing during feeding, gut microbiome development, and parental stress.
Despite widespread marketing, no medication has been proven to cure infant colic. Many products marketed for colic have not demonstrated effectiveness in high-quality studies.
Safe and supportive strategies include:
- Ensuring proper latch during breastfeeding
- Holding the baby at approximately a 45-degree angle during feeding
- Frequent holding and skin-to-skin contact
- Singing, white noise, or familiar background sounds
- Gentle clockwise abdominal massage
- Regular tummy time
- Leg exercises such as bicycle movements
- Using warmth, such as a warm cloth or tummy-to-tummy contact with a parent
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