Orphan kitten, possible bladder infection?

I just picked up two orphan kittens to foster. They are 3 weeks old. The girl has been leaking urine almost constantly.She will dribble when I stimulate as well but not as much as her brother.

She's always wet, even after I have stimulated and dried her off.

Could it just be immaturity or perhaps she wasn't stimulated on a regular basis prior to being brought in. Her mother was supposedly killed on the road..not sure how long before the kittens were brought in.

Anyone experienced this?

No.  I would take her to the vets for a check.

Just a quick update. She's on antibiotics. Vet said could be just an infection or she could have an ectopic ureter.  

If its the latter, she will have to be euthanized. Please send her your prayers.

Fingers crossed it's an infection.  Having looked up 'ectopic ureter' I agree that if that's what she has then pts is kindest.    She is a very cute kitten, love the black spot on her nose.