Just keep repeating:

He is just a baby.....he is just a baby....

He will outgrow this, but 10 week old puppies dont' have much warning when they have to go. When they have to go, they GO. About like a 2 year old child.

Be patient with him, feed him on a schedule, do not feed after 8PM at night, and I take up water shortly after the last feeding as well.

It might be good for a couple of weeks to set your alarm for 4 hours after you go to bed and get up and take the puppy out.

Please make sure you are food rewarding him each time he eliminates outside.