I found dry suits for that size are very hard to find. By the time my kids were comfortable going down a river I bought the Kokatat kids suit but it is sized for a 14 or 15 year old. We bulled the suit up till the crotch was in the right place, then folded the body and held it in place with a cam strap that had the extra length cut off. The legs were baggy, but not too bad, same with the arms. Worked for us during the early years.