Methods and systems are described for multispectral, non-invasive, and real-time assessment to diagnose hemorrhaging and/or hypoxia through PA imaging through an acoustic window defined in a body, such as through transfontanelle PA imaging of a neonatal infant brain. Such methods and systems include transmitting a plurality of ultrasound (US) waves and light between the probe device and the acoustic window, converting, via the probe device, a plurality of reflected US waves and generated PA waves into a plurality of US and PA signals, displaying in real-time on an US machine communicatively coupled to the probe device one or more images of the brain or spinal cord through the acoustic window, such as the neonatal infant brain through the fontanelle, and diagnosing at least one of one or more hemorrhages and hypoxia in the neonatal infant brain at least partially based on the one or more images.
