Geez you sound like you're the same person as me living in an alternate universe or something. lol My first two were so easy, and like yours, were both sleeping through by 9 weeks. My first at 6 weeks, and second about half way through his 8th week. This third boy though. Wow, he loves his night time feeds. He does sleep through about half the time now, but if he does that he's usually up by 6am. Otherwise he sometimes wakes at either 1am or about 4am which were the times he used to have his 'night' feeds when he was a newborn.
Max was born on the 15th of March, so less than two weeks apart.