C.W.
Hi F.,
I used a life jacket for my daughter who is now three years old. It is easy to hold on to her with the straps and all and it will keep her afloat. Arm floaties are good once they are used to the water and not afraid of their head going under...my daughter just started to use them last year. My daughter is only about 30lbs and about 3 feet tall... She is small too. She is now swimming basically on her own as long as I stay near. so try a life jacket you can get them just about any sporting good store.
C.