OK this really intrigued me so I asked elsewhere and this is what they said..
Hope it helps you out mate.
Hello
I change my name a few yrs ago and don't need the assistance of a lawyer. A
new law was enacted a few years ago to help an average citizen to make
corrections to their birth certificate without a lawyer. You still need to pay a
fee and lots of patience. Go to the town/city census office( office where you
apply for a copy of your birth certificate) where you was born and ask for
assistance. Or if you reside away from your birthplace, go to the census office
where you live and apply there. It will take longer because they will forward
the papers where you was born. it's a long journey, I went straight to the
census office. I live in Baguio and was born in san fernando, La Union. They
gave a list of supporting documents for proof of my current name and start from
there.It's along process and lots of patience.
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sorry to hear it took you long time, but it sound like you were changing your
name.
If your parents just put boy or girl and hadn't picked a name yet all you need
is
a statement from them that NSO will add to your birth record. Only takes a few
days
and little money. I have heard of one person that in addition to the letter from
a parent they also were asked for a copy of their baptism, but that was just one
case and was still quick and easy.
......................................................................................................................................
This has been a problem innthe Philippines for a long time now. SO
much so they set up a special method by which people can straighten
out their birth certificates. Read this act..
http://tinyurl.com/m4twn
It amounts to going to the the city clerk office and filling out the
paper work for the correction.. if they do not see the mistake as a
clerical error then she may need to she a judge to have it straighten
out..
The Baby girl and Baby Boy problem is frequent this is due to the fact
that many Filipino families(provincials country folks the plain
simple kind) do not wish to give the child a name till it is one year
old for fear the evil spirits can find it or some such thing if you
call the baby by it true name.