A.B.
Not sure what everyone else has said... but if it is just tiny bit and only leaving a little bit here and there on the clothes and dried on the belly button (so it is not dripping out like a cut that bleeds) it just means that it isn't all they way dried out yet. this happened with 2 out of 3 of my kids and my doctor said to just wipe it out with alcohol wipes each diaper change. You can also use a q-tip dipped in alcohol. the alcohol will help it to dry out. With doing that it will dry up soon.
however if it is more that just minimal ask your doctor (you can always call teh doctor on call or nurse and ask them so you don't have to make a trip in)