no. he is not likely getting sexually aroused. little boys can have random erections all of the time (ask the big boy in your life! ). children get pleasure from being snuggled so just snuggle him. if it creeps you out if he is interested in the feet just say no. one of my kids liked to play with other people's earlobes when he was little. just re-direct him or distract him away from those feet and i am he may give up this habit soon. you are wise not to embarrass him so be tactful. if he turns out to be an adult with a foot fetish someday (not that uncommon) he will most likely do it private and not bother anyone. you will still love him anyway.
my son is 5 years old and seems to be getting aroused with my wife's feet? why and what can we do? should we be worried? . we don't want to embarrass him but he continues to try and snuggle with my wife's feet and today she noticed that he had an erection why'll trying to touch her feet.