Neonatal Intensive Care Unit (NICU)

 

This page will focus on audiology and speech-language pathology services that are unique to the neonatal intensive care unit (NICU) setting. Visit the following ASHA Practice Portal topics for detailed information:

When speaking to parents about feeding their infant, the clinician uses nongendered terms for inclusive communication (American Academy of Pediatrics [AAP], 2021). Examples of nongendered terms for feeding the infant include “chestfeeding” instead of “breastfeeding” and “human milk” instead of “breast milk” (AAP, 2021; Bartick et al., 2021). However, the majority of the literature is limited to breastfeeding, and outcomes may not always apply to chestfeeding of human milk. This Practice Portal page will use the term “breastfeeding” when referring to specific research. The clinician must be responsive to how parents refer to feeding their infant.

Medically fragile newborns are admitted to the NICU when they require specialty care. These newborns may need specialty care because of physiologic instability associated with prematurity, congenital disorders, or other conditions that make them vulnerable. Although infants in the NICU benefit from the highly specialized medical care that they receive, the NICU can be a stressful environment for the infants’ sensory, motor, social/emotional, and cognitive systems (Graven & Browne, 2008b). This stressful environment can lead to long-term adverse consequences to the infants’ physiology and neurodevelopment. The NICU environment can also be overwhelming for parents because their role as primary caregiver is altered (Woodward et al., 2014). Parental and infant stress negatively affects parent–infant relationships and child outcomes (Cong et al., 2017). The provision of neonatal therapy aims to prevent and protect against those adverse effects using trauma-informed, collaborative care, and family-centered models.

Neonatal therapy integrates the typical development of the infant and family into the environment of the NICU using theories and scopes of practice from occupational therapy, physical therapy, and speech-language pathology (Craig & Smith, 2020). Neonatal therapy requires additional knowledge of medical diagnoses and interventions in the NICU to provide safe and effective assessment, planning, and treatment (Ross et al., 2017). A neonatal therapist (NT) can be an occupational therapist, a physical therapist, or a speech-language pathologist with highly specialized knowledge of how to provide evidence-based, family-centered services to support development, prevent or reduce adverse consequences, and nurture infant and family relationships (National Association of Neonatal Therapists, 2022). Many NTs receive a specialty board certification to show that they meet the minimum standard of education, experience, and knowledge needed in the NICU. The AAP (Stark et al., 2023) described guidelines about the following six core practice domains that the NT addresses to provide appropriate care for the neonatal population:

  1. environment
  2. family or psychosocial support
  3. sensory system
  4. neurobehavioral system
  5. neuromotor and musculoskeletal systems
  6. oral feeding and swallowing

Fetal/Embryology and Neonatal Development Review

To better understand the neurodevelopmental impairments associated with prematurity and other high-risk diagnoses, it is necessary to understand the basics of embryology and fetal neurosensory development. Special attention to the fetal period is necessary when caring for prematurely born infants as this period of development often occurs in the NICU instead of the supportive and protective intrauterine environment.

Embryonic and fetal periods are described in weeks postconception (WPC), which occurs 2 weeks after the last menstrual period. Therefore, WPC is the infant’s gestational age (GA) minus 2 weeks. The fertilization period is the first 2 weeks after conception, followed by the embryonic period and the fetal period. For more information about age and birthweight classifications, visit ASHA’s resource on common terminology and diagnoses in the NICU.

The relevant development stages are as follows (Elshazzly et al., 2023; Hasegawa et al., 1992):

Embryonic Period

  • 3–4 WPC (5–6 weeks’ GA): Neural tube begins to form and completely closes by Week 4. The neural tubes will become the brain and the spinal cord.
  • 5–8 WPC (7–10 weeks’ GA): Development of the major organs and body systems begins via the process of organogenesis. Early anatomical structures that make up the aerodigestive tract—such as the oral cavity, nares, maxilla process, and mandibular arch—begin to form.
    • In Weeks 6 and 7, the lips and the tongue take form, and primary palatal fusion occurs.
    • Secondary palatal fusion occurs in Weeks 8 and 9, which is a pivotal moment for fetuses to avoid a cleft.
    • By the end of Week 8, all extremities are distinguishable.

Fetal Period

  • 9–11 WPC: All basic brain regions are formed by the beginning of this period. Teeth and taste buds form; extremities are developed and functional as the fetus begins to explore movement by opening and closing their fists and moving their upper and lower extremities.
  • 12–16 WPC: Rapid division of cells within the central nervous system begins via a process referred to as “neurogenesis.” The newly developed neurons migrate to the ventricular and subventricular zones during this time. After they migrate, they develop axons and dendrites to become a part of the neural network. Earliest evidence of fetal sucking and swallowing of amniotic fluid is observed in this period. Additional milestones include the formation of the vocal folds; the moving of hands/fingers to mouth for sucking; lung growth; and response to light by turning away, even though the eyes are still fused. The structural parts of the ears are still developing within the first 20 weeks of gestation (Graven & Browne, 2008a).
  • 17–20 WPC: The fetus has a sleep/wake cycle, and loud sounds may cause them to wake; more movement occurs, including kicking; and neurological sensory development continues.
  • 21–24 WPC: The fetus is approaching viability; the lungs are developed, but gas exchange is not yet possible outside of the uterus; and eyelids may start to part. The first responses to sound, particularly with low-frequency stimuli, occur between 20 and 25 weeks’ gestation (Lasky & Williams, 2005).
  • 25–28 WPC: Synaptic pruning starts, which is necessary to make way for new neurosensory connections; body fat starts to increase; and surfactant starts to develop in the lungs. Myelination begins at 25 weeks and continues until term birth.
  • 29–32WPC: Physiologic flexion continues to develop as the intrauterine space becomes constricted due to fetal growth, independent thermoregulation develops, and the skin is no longer translucent. By 30 weeks’ gestation, the auditory system is functional, and adultlike responsiveness occurs (Graven & Browne, 2008a; Lasky & Williams, 2005).
  • 35 WPC: The brain continues to develop but weighs only two-thirds of what it should weigh at term birth.
  • 36–40 WPC: Suck/swallow/breathe coordination refines for oral feeding.

Content Disclaimer: The Practice Portal, ASHA policy documents, and guidelines contain information for use in all settings; however, members must consider all applicable local, state and federal requirements when applying the information in their specific work setting.

ASHA Corporate Partners