A Baby Is Not Starting From Zero At Birth
Before birth, babies have already been:
- moving
- adapting to position
- responding to pressure
- developing patterns of tone and organization
- experiencing rhythm, sound, containment, and the physiological environment of the womb
So the question is often not, “What is wrong?” but rather, “How has this baby been organizing before birth, through birth, and now after birth?”
What changes after birth is the entire context in which the baby must continue adapting.
Influence of the Intrauterine Environment
During pregnancy, babies grow within a relatively confined space in the uterus.
As the baby grows larger in the final weeks of pregnancy, the available space becomes more limited. The baby's position within the uterus, the shape of the uterus, and the position of the placenta can all influence how the baby moves and rests during this time.
Some babies spend extended periods in positions that place gentle but sustained pressure on certain parts of the body. For example, babies may rest with the head turned predominantly to one side or with pressure along the jaw, neck, or shoulders.
These positional patterns are a normal part of fetal development, but they can sometimes contribute to small differences in muscle tone or movement patterns after birth.
Because the infant skull is designed to adapt during birth and early development , the cranial bones and sutures play an important role in how the baby continues organizing movement, feeding, and regulation after birth.
Early Development
Early development is not about forcing the body into change.
It is a process of supporting healthy coordination already present and easing the factors that may interfere with feeding, movement, digestion, and regulation.
Early infancy is a period of rapid development. During the first months of life, a baby’s nervous system, musculoskeletal system, and feeding reflexes are rapidly organizing and integrating.
Feeding is not simply a matter of sucking. It requires precise coordination between breathing, swallowing, tongue movement, jaw motion, and the developing nervous system.
These processes involve communication between the nervous system, cranial nerves, cranial structures, musculoskeletal tissues, developing airway, and the internal systems that support breathing and digestion.
Because these systems are still developing, small variations in muscle tone, coordination, mobility, or adaptation can influence how easily a baby feeds, settles, and moves.
A note for parents
It is normal for babies to have immature patterns, temporary difficulty, or periods where they need more support.
That does not mean something is wrong with them. It means they are still growing, adapting, and organizing.
Suck–Swallow–Breathe Coordination
Infant feeding depends on a rhythmic coordination between three essential actions:
- sucking
- swallowing
- breathing
This pattern is organized primarily within the brainstem, which contains neural circuits responsible for coordinating repetitive motor patterns such as sucking and swallowing.
Several cranial nerves participate in feeding coordination, coordination, including those involved in jaw movement, lip seal, oral sensation, tongue movement, swallowing, and airway protection:
- Trigeminal nerve (CN V) – jaw movement and oral sensation
- Facial nerve (CN VII) – lip seal and facial muscle activity
- Glossopharyngeal nerve (CN IX) – swallowing reflex and pharyngeal sensation
- Vagus nerve (CN X) – swallowing coordination, airway protection, and parasympathetic regulation
- Hypoglossal nerve (CN XII) – tongue movement and positioning
When it is immature or strained, babies may appear to work harder during feeds, become disorganized, swallow more air, or have more difficulty settling afterwards.
BREATHING, DIGESTION, AND NERVOUS SYSTEM coordination
Feeding does not end at the mouth
What happens after swallowing — including how the diaphragm, nerves, and digestive tract coordinate — plays a key role in how comfortable a baby feels after feeds.
During feeding, milk passes through the mouth, pharynx, and esophagus into the stomach, and then through the intestines as the digestive system coordinates swallowing, stomach emptying, intestinal motility, gas movement, and bowel evacuation.
This process depends on coordinated activity between several systems of the body. The tongue and swallowing muscles guide milk toward the esophagus, while the diaphragm helps regulate pressure within the chest and abdomen. These pressure changes support both breathing and digestion during feeding.
Along the digestive tract are small muscular valves called sphincters. These structures help regulate the movement of milk, air, and digestive contents as they pass from one part of the digestive system to another. Important examples include the valve between the esophagus and stomach, the outlet of the stomach, and the muscles involved in bowel evacuation.
In early infancy these systems are still developing. Coordination between swallowing, breathing, stomach emptying, and intestinal movement gradually matures as the nervous system and digestive system organize their patterns of activity. Because these systems are closely connected, some babies may experience temporary patterns such as:
- gassiness or trapped wind
- frequent spit-up
- digestive discomfort after feeds
- straining during bowel movements or irregular stools
Many babies already have the capacity to feed and digest more comfortably as their systems mature. Support can help by easing the tension, pressure patterns, or coordination challenges that may be getting in the way. In many cases these patterns improve naturally as babies grow and their digestive coordination matures.
Nervous System Coordination in Digestion
Digestion in early infancy is also closely connected with the nervous system and breathing.
The vagus nerve, which emerges from the base of the skull, helps regulate swallowing, stomach activity, and intestinal movement.
The phrenic nerve controls the diaphragm — the primary muscle involved in breathing.
As babies breathe, the diaphragm moves rhythmically, creating gentle pressure changes between the chest and abdomen. These movements help support:
- movement of milk through the esophagus
- stomach emptying
- movement of gas through the digestive system
- intestinal motility and bowel movements
Because these systems are closely connected, feeding, breathing, digestion, and nervous system regulation often influence one another during early development.
For some babies, small differences in coordination or tension around the neck, diaphragm, or abdomen may influence how comfortably these systems work together.
Tension Patterns in Infants
During early infancy, babies are still learning to organize movement, posture, and feeding coordination.
The muscles of the mouth, neck, and body work together to support breathing, feeding, and early movement. Because these systems are still developing, some babies may hold more tension in certain areas of the body.
This tension may influence how easily a baby feeds, settles, or moves.
Tension patterns in infants can sometimes develop as a result of:
- birth forces and compression during delivery
- positioning in the womb
- early feeding patterns
- the developing nervous system organizing movement and reflexes
These patterns are often subtle and may appear as small differences in how a baby moves or feeds. Parents may simply notice that something feels ‘off,’ even if it’s hard to describe.
The Infant Cranium & Early Coordination
At birth, the bones of the infant skull are not yet fused. They are connected by soft joints called sutures and fontanelles, which allow the skull to adapt during birth and accommodate rapid growth in early life.
Because these bones are still mobile relative to one another, the infant cranium is capable of subtle adaptation as the baby moves, feeds, and develops during the early months of life.
Several cranial bones form the structural foundation of the face, jaw, and airway. These include:
- the occipital bone at the base of the skull
- the temporal bones, which house structures of hearing and balance
- the maxilla and palate, which form the roof of the mouth
- the sphenoid bone, located centrally within the cranial base
The sphenoid bone is sometimes described as a central organizing structure of the cranial base because it articulates with many surrounding bones of the skull.
Through these relationships, it helps support coordination between cranial nerves, the muscles of the mouth and throat, and the structures involved in breathing and swallowing.
The soft spaces between these sutures are called fontanelles, sometimes referred to as the “soft spots” on a baby’s head. These flexible areas allow room for brain growth and gradually close as the skull develops.
