Can magnets and ultrasound make child feeding tubes safer?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Informed consent must be obtained from the patient or a Legally Authorized Representative (ex. parent/guardian) before any study-specific assessment is performed * Weight ≥5 (Phase 0, Phase 1, Phase 2) * Weight ≥3kg and \<10kg (Phase 3) * Estimated abdominal wall thickness ≤3cm * Indication for gastrostomy tube placement, with or without jejunal access tubing via gastrostomy tract, determined to be present for any of the following reasons: * Anatomic: Ear, nose, or throat abnormalities (Pierre-Robin sequence cleft lip palate) * Neurologic: Head trauma, Cerebral palsy * Bowel Disease: Short Bowel syndrome, intestinal dysmotility, inflammatory bowel disease, malabsorption * Failure to Thrive: Cystic Fibrosis, Cholestasis, AID, Chronic renal failure, and food refusal * Patient determined to be an appropriate candidate for PUG, PEG, or PRG by the clinical care team * Anticipated discharge \> 24 hrs following gastrostomy Exclusion Criteria: * Temperature ≥ 38 C * Systolic BP \< 80 or \> 180 mmHg * Heart Rate \< 50 or \> 160 * Estimated abdominal wall thickness \>3cm * Coagulopathy defined by INR \> 1.7 or Platelets \<50,000 * Presence of a contraindication to being in proximity to a magnet (e.g. implantable metallic device). * History of prior gastrostomy, gastrectomy (partial or complete), or abdominal trauma or upper-abdominal surgery. * Scoliosis * Atypical organ placement including microgastria * Involvement in other investigational trials within 30 days prior to screening, * Pregnant or nursing (lactating) women, where pregnancy is defined as the state of a female after conception and until the termination of gestation, confirmed by a positive hCG laboratory test * Patients with HgB \< 7g/dL, or fluid resuscitated within 48hrs prior, or received blood transfusion within 48hrs prior, or active life threatening GI bleeding * Esophageal Diseases: Atresia, stricture, caustic ingestion * Spinal anomalies or atypical organ placement * Any other medical condition(s) that may put the patient at risk or influence study results in the investigator's opinion, based on the performance of a pre-procedural assessment.