berit milah on shabbat

Question

Dear Aaron, I am expecting a baby boy in about six weeks (my first child). In the event that the boy is born on Shabbat, we face the following problem: There is no way to conduct a berit milah on shabbat in the synagogue, because of the issur of hotzaa (although there is an eruv here, we do not rely on such legal fictions in cases of a safek d'orayta.) Holding the berit milah at home would introduce complications because of the walking distance to our home and the unavailability of space for the seudat mitzva. Is there any basis for the idea that carrying a newborn baby through a karmelit is permitted because of the principle of chai nosei et atzmo? There is a tosafot in Masechet Shabbat that suggests that carrying a newborn to its berit is only an issur derabanan. If it were possible to ascertain that a route to the synagogue was only a karmelit, would it be okay to carry the baby based on the concept of a shevut d'shevut b'makom mitzvah? Alternatively, could a non-Jew be asked to carry the baby? The mitzvah would be enhanced by this act because it would allow brov am hadrat melekh. A second question: I read that the minhag of sepharadim is to say the beracha of l'hachniso bibrito shel avraham avinu prior to the beginning of the actual milah, rather than between milah and periah. This is based on a teshuva of the Rambam and is cited by Rav Ovadiah Yosef. What is your father's take on this? A third question: What is the halakha about pidyon haben. Should it take place on the thirtieth or thirty-first day, and can it be held at night? Lastly, on an unrelated point, I still don't understand why you think keeping yashan based on the available research makes sense. Lo nitnah hatorah l'malachei hasharet! This information is all we have, and although it is true that the codes provided do not have to be adhered to by the companies in question, the fact remains that we don't have to assume that they deviate from them. It still appears to me wiser to avoid the foods that are chadash based on this research because of the safek d'orayta involved, and if the facts of the situation change unpredictably, we are not responsible for this. May Hashem bless you for your continued struggle to uphold the truth of Torah even in the face of opposition.