Hello, the doctor! My son (5, 5 years) complains that it or he " is hurted by two bo...

[Natalia]

Hello, the doctor!
My son (5, 5 years) complains that it or he " is hurted with two sides " hardly below ribs. The pain not a constant, appears and vanishes, but, apparently strong enough. Prompt please, to what expert it is better to address for statement of the diagnosis.
In advance thanks!

[Brejkin D.V.]

For the beginning to the surgeon, then to the pediatrist.