The brothers are recovering at Morriston Hospital. The year-old was found by the rescue helicopter crew and taken to hospital.
I Parfitt, watch manager at Swansea Coastguard said: "The coastguard recommends that anglers who are fishing on their own close to the water's edge and from an unstable platform, such as rocks, should wear a lifejacket or buoyancy aid. Brothers rescued at Llangennith, Gower, after swept off rocks Published 2 August image captionLlangennith beach on Gower Two teenage brothers had to be rescued from the sea near Llangennith, Gower, after one fell off rocks and the other jumped into save him.
After the second brother jumped in, a third friend ran to a nearby beach and used a walker's mobile phone to raise the alarm at BST on Wednesday. His older brother remains ,langennith hospital, said South Wales Police.
His year-old brother dived into the sea in an attempt to save his brother but the pair had to be rescued. A klangennith member of the group kept watch over the brothers until help arrived.
The pair were airlifted to Morriston Hospital, Swansea, where the year-old was pronounced dead. Merseyside teenager dies after fall into sea at Llangennith Published 2 August A year-old boy has died after falling off rocks while fishing near Llangennith, Gower. The RNLI said its Atlantic lifeboat from Burry Port had rescued the older brother and landed him onto Broughton beach into the care of coastguards before he was flown to hospital.
Det Insp David Hough said: "This was a very tragic incident and our thoughts are with the family at this sad time. A fourth person kept watch over the brothers until help arrived.
Will Parfitt, watch manager at Swansea Coastguard said: "The coastguard recommends that anglers who are fishing on their own close to the water's edge and from an unstable platform, such as rocks, should wear a lifejacket or buoyancy aid. One brother was picked up by Burry Port lifeboat and the other was winched from the water by the helicopter.
The brothers, from Merseyside, had been fishing with two other friends at Blue Pool corner on Wednesday evening. The pair had been fishing at Blue Pool corner with two other friends when the incident happened.