Last week we visited the sofer to order a set of tefillin for my son who will be bar mitzvah this spring. On the way home my wife asked me whether he needs to recite she’hechiyanu. By coincidence, my friend Chaim Markowitz discussed that very topic on his blog last week, so take a look there for the answer. I’ll just add one point that I saw in the quoted in the name of the Rav (Reshimos Shiurim Sukkah, p. 240) :
The Rambam writes in hilchos milah (3:3) that after the milah is performed, the father of the child (mashma: even if someone else does the milah) recites the bracha of she’hechiyanu.
Yet, with respect to pidyon haben, the Rambam writes (bikkurim 11:5) that the father recites the bracha of she’hechiyanu before the money for pidyon is given to the kohen.
So which is it – is she’hechiyanu recited over l’asiyasan, before the performance of a mitzvah, as the milah case indicates, or is it recited after the mitzvah is completed, like the pidyon haben case?