wow, i don't know how you ladies get your babies to fit in such small diapers. my little lady was out of 2s weeks ago and she just turned 4 months. and i'm 5'2" and my husband is 5'8". i guess she's just chubby. :-)
that being said, i found that natural babycare is a really good diaper and "eco friendly" to boot. i just got back from my parents' place and they got us pampers and i dunno...i just felt the natural babycare dipes seemed more leakproof. my daughter doesn't leak too often, but just feeling the outside of the diaper, the pampers felt really flimsy. target now carries them.
it almost sounds like the diaper is not absorbing the BM fast enough, it kind of dribbles around, he moves, and then he leaks.
anyway, if you decide to give them a whirl, they feel really stiff when you take it out. just open the diaper and soften it up a tad by scrunching (?) the crotch area a tad.
also, plastic covers for someone that small, you need to order online from a cloth diaper place or try out tiny tots in campbell. i don't know if there are other cloth diaper boutiques in other parts of the bay. sometimes target or BRU has them, but usually only in larger sizes for potty training. at 9 weeks, you need something really small.