I buy bumpkin , FuzziBunz and Thirsties when I be build my stash for my first child and the Thirsties fit my daughter the best from day one -lrb- well technically day 3 -rrb- . my daughter be 7 lb 6 oz , tall and skinny . the Thirsties cover fit she the best . the extra smalls -lrb- newborn -rrb- be great for she tiny butt and she wear they until she be about 4 month old . my daughter be now 5 month and the smalls be just now fitting she well . I like that the tab have the velcro material on they so you can overlap they for really skinny baby . the leg gusset be a little loose when my daughter be 3 month and under , but ever since she gain a bit of weight -lrb- maybe by 09 lb -rrb- they fit she perfectly . and the leg gusset do not leave mark on she leg like the bumpkin do -lrb- too tight maybe ? -rrb- . the few time my daughter have blow out of she cloth diaper , the Thirsties contain the mess well , unlike the bumpkin which get the poo everywhere . I be definitely keep these thirsty for the next child .