Lots of puppies this age are "excited pee-ers", my own included. Rule out a UTI or any medical reason, but beyond that all you can really do is be consistent with the potty training (weak bladder muscles at a young age plays a role), don't make a big deal of it, avoid over-excitement (we hate the "OMG PUPPY!!!!!" talk in our house... instant puddle)... just carry on business as usual. It's not really something you can correct them for... most will outgrow it.
Delta zur Bindenburg- 11/15/13
Gentle Tripp- 6 yr old OTTB mare