A–Z Glossary

Muscle tone

Muscle tone is the baseline level of tension in muscles, which can affect how an infant holds the body and moves.

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How babies gain muscle control

How babies gain muscle control

Muscle control is a neuromuscular achievement At birth, a baby has muscles, but the neural control of those muscles is immature. Muscle contraction depends on signals traveling from the brain and spinal cord through motor nerves to neuromuscular junctions, where nerves communicate with muscle fibers. In early life, these pathways are still being refined. The […]

Core Strength and Posture Development

Core Strength and Posture Development

What Core Strength Means in Infancy In infancy, core strength refers to the coordinated activity of muscles and connective tissues around the trunk, pelvis, spine, and shoulder girdle. It is not simply the ability to produce force. Effective postural control requires anticipatory and reactive adjustments: the baby stabilizes the trunk while moving the head, reaching […]

Active Sleep vs Awake Behavior in Babies

Active Sleep vs Awake Behavior in Babies

What active sleep means in infancy Active sleep is the infant state broadly analogous to rapid eye movement sleep, although the terminology and physiologic boundaries in newborns are not identical to those in adults. It occupies a large proportion of sleep in early life. During active sleep, the brain remains relatively activated, while the body […]

Signs the Daily Schedule Has Too Much Sleep

Signs the Daily Schedule Has Too Much Sleep

What “Too Much Sleep” Means in a Baby There is no single sleep total that defines too much sleep for every baby. Newborns commonly sleep in fragmented periods across the day and night, while older infants gradually develop longer nighttime intervals and more consolidated naps. Illness recovery, a growth phase, vaccination, travel, disrupted nighttime sleep, […]

Why babies move constantly

Why babies move constantly

Movement begins before birth A baby who seems to wiggle constantly is often continuing a pattern that began in the uterus. Fetal movement is not a late add-on to development; it is one of the earliest visible expressions of an active nervous system. Long before purposeful reaching or crawling, the fetus practices whole-body stretches, isolated […]

Dropping Objects Repeatedly From the High Chair

Dropping Objects Repeatedly From the High Chair

Why Repeated Dropping Happens From an adult perspective, dropping the same spoon ten times may look inefficient or intentionally provocative. From a baby’s perspective, it can be a compact science experiment. Infants learn through sensorimotor exploration: they act on objects, watch what happens, and repeat the action to test whether the outcome is predictable. Dropping […]

Physical development activities baby

Physical development activities baby

How physical development unfolds in infancy Infant motor development is influenced by neuromuscular maturation, postural control, sensory feedback, opportunities to move, and the quality of responsive interaction. Gross motor milestones involve large muscle groups and whole-body movement, while fine motor skills involve the hands and fingers. These domains interact: a baby who can stabilize the […]