T Cut, Ox and Harpic rejoined the seal colony in north Norfolk on Friday 24 January.
Over half of the seals in their colony were killed by the Phocine Distemper Virus (PDV), which hit the UK last year.
Nursed back to health
The three baby seals, called pups, were among the 40 animals nursed back to health at the RSPCA's wildlife hospital
at East Winch, near King's Lynn, Norfolk.
Alison Charles, the hospital's deputy manager, said "We never thought we would see this day after so many exhausting months."
20 more seals will be released over the next few weeks, and the rest will be freed when they have gained more weight.
Hear story
Win animal cartoon tickets
Seal quiz
