Child Having Stomach Pain After Falling On Stomach While Ice Skating. Any Chances Of Internal Injury?

Hello. My 7year old son fell on his stomach pretty hard while ice skating yesterday (several times). He complained of stomach pain last night when going to bed. He said several times during the day today that his stomach is still hurting. When i ask specifically to show me where, he says his whole stimach. When i feel around to see if thhere are any tender spots they seem to be on the left and right sides of his stomach. Not in the middle. He has no fever, and has been able to eat and drink during the day. He does not have a big appetite though today. I am just worried because i cant tell ifits muscular or if he has some sort of internal injury. Any help would be greatly appreciated. Thank you!