I would go ahead and treat the others only because its too simple and to prevent the possibility of waiting and then chancing reinfection to the little one..They are normally all treated at the same, maybe he didn't think about telling you this....wow, thats quite expensive for cleaning and drops....the drops are usually $12.00..what kind of q-tips did he use, lol....
must have been his skilled technique...I'm not being ugly, it just kind of urks me the $$$ some of the vets charge us for something another one charges 1/4 of...we're at their mercy in a sense...congrats on your new baby!!!!