C.K.
i wore them immediately starting when i got my period just before my 10th birthday. my mom used tampons exclusively so that is what she showed my sister and me. she had us read the insert and follow the guidelines. i got my period in the summer and we had a pool. i was also a competitive swimmer.
they make so many types. those multi-pack boxes have junior ones in them. i just gave those ones to my neighbor's daughter who just started.