If they are just arm floaties, not attached to a vest on the body, please stop using them. They can CAUSE drowning.
If the child's arms get above the head the child can't bring them down. The mouth ends up below the water. It's terrifying and dangerous.
I learned about it here several years ago and didn't believe it. Went to my brother's place on vacation, happily letting DS use the floaties (after all that's how my brother and I learned to swim) and the exact scenario played out. With DS in arms reach but behind me.
And like all drowning, it was silent. He was so busy trying to get his arms down and face up that he was silent. It was my brother looking behind me and getting a funny expression on his face that clued me in and I was able to save DS. He was saved and comforted. The floaties got popped, and he got a proper swim best the next day.
If they are just the arm floats, please please don't learn from your own experience.