Late preterm infants are defined as those born between 34 and 36 weeks and 6 days of
gestational age. Although the medical literature places significant emphasis on extremely
low birth weight and extremely preterm infants, late preterm infants are also at risk,
with mortality rates three times higher than those of term infants. Born with lungs and
brains that are not yet fully matured, late preterm infants may experience complications
due to immaturity. Although they often appear healthier and more mature than they are,
late preterm infants show significant differences from term infants (born between 37 and
42 weeks of gestation), particularly because their brain development has not yet been
completed.
During the final weeks of gestation (34-40 weeks), critical developmental processes occur
in the brain, including the formation of synaptic connections, myelination, and the
development of cortical folds. Compared to normal term neonates, the late preterm brain
appears 20% to 30% smaller, less developed, and less myelinated on magnetic resonance
imaging. The sensory system is shaped immediately after birth by both the quantity and
type of sensory experiences and continues to develop throughout life. In preterm infants,
sensory processing has been associated with immaturity at birth, length of stay in the
neonatal intensive care unit, white matter injury, and caregiver education.
Sleep is a critical factor for the healthy development of processes such as brain
maturation, motor planning, postural control, and sensory integration, especially during
infancy. Sleep is closely linked to brain development and infant behavior, and
disruptions in sleep patterns can have profound and long-term effects on an infant's
overall health, growth, and well-being in early life. Moreover, sleep plays a crucial
role in the formation of persistent neural circuits necessary for early sensory
development and the maturation of primary sensory systems in infants. The aim of this
study is to investigate the relationship between sleep characteristics and motor
development and sensory processing skills in late preterm infants (born between 34 weeks
and 36 weeks + 6 days of gestation) who are between 6 and 12 months of corrected age. It
is thought that sleep problems, which are frequently observed in preterm infants, may
have significant effects on motor and sensory development. In this context, the primary
objective of the study is to elucidate how sleep patterns and characteristics are
associated with motor and sensory development in late preterm infants, and to provide
scientific evidence to inform early intervention programs.