3 Ontario children have died while swimming since Friday evening.

All the victims are no older than 12.

On Friday, a 10-year old girl and a 7-year old boy drowned in Lake Erie.

Niagara Regional Police are investigating the death of a 12-year-old North York boy at Sherkston Shores.

"Its just heartbreaking," says Barbara Byers with the Royal Life Saving Society, adding that the drownings could have been prevented.

Byers says keeping children safe in the water can be as easy as keeping them in arm's reach at all times.

You should also have floatation devices for your children.

She says there's a sort of 'Hollywood myth' when it comes to what drowning looks and sounds like and Byers says that's why people expect it to be blatantly obvious when someone is having trouble in the water.

"Its very quiet, its very silent ... they're trying to keep their head above water so there isn't any thrashing and there isn't any screaming."

Byers says its typical for the summer months to bring tragedies like the ones this weekend.

"We've done the research and we've found that on hot, humid weekend there is a spike in drownings."She says its the best way to make sure that escaping the summer heat doesn't turn into a tragedy.

She also says swimming lessons are never a bad idea.

"Its almost like a vaccination; a way of keeping you safe for the rest of your life," says Byers.

The Lifesaving Society offers free lessons in Toronto through the beginning of August.