In a neonate, kidney is supplied by?

Upto 5th week of intrauterine life, kidney is in lumbar region and renal aeries are branches of common iliac aery (see above explanation). After that, differential growth of abdominal wall causes the kidney to ascent to lumbar region. Adult position (lumbar region of abdomen) is attained by 9th week. Druing progressive ascent, the aeries to kidney are derived from different levels of aoa. After full ascent, definitive renal aery is branch of aoa at 2nd lumbar segment. Thus, neonatal kidney is supplied by aoa.