How should i react to my 10 month old when he plays with his penis in the bathtub?

No need to react at all. he's not doing anything wrong. If later he asks you what it's called, tell him.

Tell him what it is and what it's used for.

You shouldn't react...Most kids find their private parts around that time. He might forget about it after awhile and then find it again. When he is older just tell him to play with it in his room and not where others can see..it is private. LOL.. Most boys and girls go through this, some stop while others are better at hiding it.

You shouldn't react. It is completely normal. Ask the doctor.

normal, he might aswell be playing with his foot! it's all just his body to him.....plus, if you had a piece of your body that you only got to see in the tub, you would be interested in it too! especially at this discovery age

Let him... it's no different than finding his toes or nose... it's part of his body and he's just checking it out.

i just say "that is your penis" and just let him go on doing whatever he wants :) sometimes i'll say, do you want to wash it? and he will get the wash cloth and clean himself.