Knowledge of the Unseen Please read the following by Shaykh Monawwar Ateeq: Knowledge of the Unseen Theology: http://scholarsink.files.wordpress.com/2011/06/knowledge_of_the_unseen_theology1.pdf Dispelling False Notions Part 1 http://scholarsink.files.wordpress.com/2011/09/dispelling-false-notions_p1.pdf
Brother, I cannot answer your questions with exact reference which others will Insha Allah surely provide. Regarding the knowledge of Rasoolullah Sallallahu 'Alaihi wa Aalihi Wasallam , Hazrat Imam Suyuti Rahmatullah 'Alaih said that he had the knowledge of the 5 Unseen, but that he remained silent! And regarding the Ultra-sound thing, I already asked the question, you can check out. My brothers helped me out. You can check.
As salaam alaikum wa rahmatullah, I have heard a few statements made by scholars, who are neither Barelwi or Deobandi, regarding the Prophet (sallallahu 'alaihi wa sallam)having knowledge of the exact time of the Hour, and that he (sallallahu 'alaihi wa sallam) had knowledge of the five things mentioned at the end of Surah Luqman: 'Indeed, Allah has knowledge of the Hour and sends down the rain and knows what is in the wombs. And no soul perceives what it will earn tomorrow, and no soul perceives in what land it will die. Indeed, Allah is Knowing and Acquainted.' What have the scholars of Ahlus Sunnah said regarding such knowledge? Also, how do we explain the fact that doctors can inform you regarding the sex of your child before it is born? And the fact that we are able to forecast the weather to a great degree of accuracy? May Allah reward you for your help, Ameen.