Cute, adorable, huggable and squeezable! Shopping for little girls swimwear is best, because you can still dress them up like dolls without too much pushback!
Little Girls sizes are 2 / 3 / 4 / 5 / 6 / 7, which broadly correspond with age, but each brand has different measurements for each size, so be sure to check the sizing chart for each piece.
Shop from Seafolly, Maaji, Camilla, Funkita, Salty Ink, or Munsterkids online, with even more available in store.
Something to keep in mind for toddlers in nappies is that it's handy to have a removable bottom, rather than a one piece which has to be completely removed for changing!