dragon was born 3kg. at 8wk checkup he was just under 5kg...he's heavier now but not exactly sure how much he weighs. Was originally plannin to buy Smalls but the demonstrator convinced me that i'll get more wear out of Ms. Lucky i listened i heard NBs r a waste & if u got enough nappies to last a few weeks, id say skip the Smalls too! unless u can get them off B4B cheap. keep this in mind though, they're AIOs so take MUCH longer to dry than pockets so u might not want to use them in the 1st mth or so as ur constantly changing!