I'm just wondering really as my 3.10 yo dd took her first independant swim at the weekend. She swam for about 7ft from me to my dh about 5 times (just to make sure it wasn't a fluke).
I can't tell you how chuffed I am. There is no splashing, thrashing or flailing around, she keeps her head well above the water and it's all very calm.
She has an aversion to going under the water so I think she's done really well but don't have anything to compare her achievement to.