Group A will consist of preterm infants born < 37 weeks gestational age. Non-nutritive and nutritive sucking will be assessed using an FDA-approved device (Nfant Feeding Solution) to measure sucking activity. Additionally, those infants who have MRI of the brain for any reason during the course of their hospital admission will also be included in the study and allocated to the appropriate group accordingly. If a subject undergoes any clinically ordered EEG, EMG, MEG, and MRI throughout the duration of their study participation before the age of three then that data will be collected from their medical record. Additionally, any neurodevelopmental testing data completed up to the age of three will be collected.

Group B will consist of term infants admitted to the NICU for therapeutic hypothermia who are at risk of HIE; admitted with concern for neonatal stroke; seizures of unknown etiology; and those admitted who are at risk of abnormal neurodevelopment such as those with hypoglycemia or NAS. Non-nutritive and nutritive sucking will be assessed using an FDA-approved device (Nfant Feeding Solution) to measure sucking activity. Additionally, those infants who have MRI of the brain for any reason during the course of their hospital admission will also be included in the study and allocated to the appropriate group accordingly. If a subject undergoes any clinically ordered EEG, EMG, MEG, and MRI throughout the duration of their study participation before the age of three then that data will be collected from their medical record. Additionally, any neurodevelopmental testing data completed up to the age of three will be collected.

Group C will consist of healthy term infants from the community and term infants admitted to who had an initial uncomplicated postnatal course that will serve as the control group. Non-nutritive and nutritive sucking will be assessed using an FDA-approved device (Nfant Feeding Solution) to measure sucking activity. Additionally, those infants who have MRI of the brain for any reason during the course of their hospital admission will also be included in the study and allocated to the appropriate group accordingly. If a subject undergoes any clinically ordered EEG, EMG, MEG, and MRI throughout the duration of their study participation before the age of three then that data will be collected from their medical record. Additionally, any neurodevelopmental testing data completed up to the age of three will be collected.

The study will record the sucking activity of the hospitalized infants over time, from their first oral sucking session including non-nutritive and nutritive sucking, until discharge, using an FDA-approved device that equips a typical bottle and nipple commonly used in the NICU with a non-invasive sensor to measure sucking activity. Each infant's nutritive and non-nutritive sucking patterns will be measured, and will comprise the 'sucking session' conducted with the bottle sensor.

Primary outcome will be an assessment of the sucking activity of infants with brain injury and infants without brain injury, using an FDA-approved device for sucking assessment.

The functional and structural connectivity of the brain areas involved in sucking and feeding in infants with brain injury will be assessed reviewing the results of clinically ordered neuroimaging and neurodevelopmental tests.