Nappies in this section will fit most babies from 7 - 35lbs roughly.
As with one-size fits all clothing there is some compromise on fit versus a sized system - but you can't beat it for cost effectiveness.
Just bear in mind that any nappy that is used for 2.5 yrs day in, day out, is unlikely to look as good or function as well as it did when it was new - so unlike most sized systems we do not expect that these nappies will "do two babies". This is not because we sell inferior products, we are just being honest.