Julia,
You wrote about a two week old with short frenulum  and clicking sounds and
nice weight gain so far.
My response is to keep watching that baby for weight gain a few more weeks
and for constant hunger.
I once wrote about the baby I saw.  First look at him showed me a tied
tongue.  Then much to my surprise, he sailed through the day and the next and
the next two weeks drinking and stooling and gaining weight.
After two weeks, mother's abundant supply started to dwindle and baby started
constant nursing and slow weight gain.  No sore nipples (very elastic type
nipples).
Kittie Franz wanted to see this baby after mom described her problem at a
Philly conference where Kittie was speaking.
By the time, the problem was clear to all of us, they had started bottle
feeding and mom's supply was really low.  We learned a lot from this one.
I saw two such cases in the last two weeks.
Just stay watchful for a few weeks.

Opal Horvat, BA, IBCLC
Bergenfield, NJ