I'm a first timer so this might be a stupid question but I have no idea when I'm supposed to switch my DD to the regular bath tub. She has the blue baby tub that has a sling for when she was an infant, a recliner for when she was a little bigger and flips around now that she's sitting up on her own. She still fits lengthwise and all - her legs aren't overflowing the tub or anything. She just turned 1 last week and I don't know when to make "the big switch." The regular tub just seems so big compared to her... I don't want her flopping over and hurting herself or anythin. Any suggestions would be appreciated.