Boy dead and another critical after separate NSW pool accidents

A three-year-old boy has died and a two-year-old boy is in a critical condition after two separate accidents involving backyard swimming pools in Sydney's south yesterday.

The three-year-old boy died in hospital after collapsing near a backyard pool at a home in Riverwood at about 5.30pm.

Officers from Campsie Local Area Command and paramedics attended and found the boy unconscious, working frantically to save his life before he was taken to Sydney Children's Hospital in a critical condition.

He died a short time later.

Police believe the boy had been swimming in the pool before he got out and collapsed.

In the second incident a two-year-old boy has been left fighting for life after being pulled unconscious from a pool at a home in Camden South at about 6.30pm last night.

Paramedics treated the boy at the scene before he was airlifted to Royal Children's Hospital in Westmead in a critical condition.

Inquiries into both incidents are continuing.