Yup, flips are my staple too! They're really reliable and versatile. My LO was five months before I even needed to think about something more for at night. Good luck! X
Oh, and my LO was 8lbs 2oz at birth, so for the first couple of weeks we put him in some bambino mio outers with 2 bumgenius newborn inserts. We were given the bambino mio, and although they're nowhere near as good as flips, (the bambino mio inserts didn't work for us), IMO, they tided us over till he got big enough for a birth to potty nappy. Also the bumgenius newborn inserts are great as a night booster in the flips, or a booster in any nappy!