Could a portable neonatal abdomen xray fulfill the requirement that the arrt wants for a pediatric abdomen?

Often, yes. I do not know what 'arrt' means, so i cannot address that specific issue. In the neonatal unit, almost all the abdominal x-rays are done portably. There are specific instances when one wuld need to transport the baby off the unit toget more high quality images or images with contrast such as an upper GI study or esophagram.