Final answer:
The diagnosis for a newborn with oligohydramnios and suprapubic fullness could be a condition called posterior urethral valves (PUV). This can be confirmed through imaging tests such as ultrasound or VCUG.
Step-by-step explanation:
The diagnosis for a newborn with oligohydramnios and suprapubic fullness could be a condition called posterior urethral valves (PUV). PUV is a congenital condition where there is an abnormality in the development of the urethra in male infants. This can lead to obstruction of urine flow, causing oligohydramnios (too little amniotic fluid) and suprapubic fullness. Diagnosis can be confirmed through imaging tests such as ultrasound or voiding cystourethrogram (VCUG).