infailible teaching of contraception

[Didacus]

In another forum, someone posted that the Catholic church's teachings in contraceptive is not for the magestorium nor is it, within the Cathloic faith, considered an infailible teaching.

Thus;

Is contraception teachings part or not of the infailable teachings of the church?

How can one know for certain if a teaching of the church is infailible or not?

I believe the pope is not, by himself, considered infailible. is this correct?

Finally; What are the prerequisites that make a teaching infailible?

I thank you in advance for your reply. Pax Christi.

[Laudate_Dominum]

The Encyclical [i]Humanae Vitae[/i] of Pope Paul VI was a definitive statement of the Church's constant teaching on this subject.

Humanae Vitae is quite clear that this is a definitive teaching and a truth of the natural law being officially elucidated according to the specific charism of the Church with regard to faith and morals.

Here is the document:
[url="http://www.vatican.va/holy_father/paul_vi/encyclicals/documents/hf_p-vi_enc_25071968_humanae-vitae_en.html"]http://www.vatican.va/holy_father/paul_vi/...e-vitae_en.html[/url]

God bless.