02/07/2013 13:26 BST | Updated 22/05/2015 06:12 BST

Video: 16-Month-Old Swims A Whole Length Underwater

Parents of a 16-month-old girl have hit back at critics who who accused them of forcing their toddler to swim a whole length of a swimming pool under water.

A video of little Elizabeth's astonishing feat has been viewed almost 2 million times on YouTube, leading many people to express both amazement and then concern that the baby is being forced to swim for such a stretch on just one breath.

But dad, Adam BC, who posted the video, points out that he is a registered nurse and his wife was a life guard for six years and taught swimming.

He also highlights that they are both professionally trained in CPR and water safety and he is certified in advanced pediatric life support.

He says that Elizabeth, has been trained properly by certified instructors who teach the infant swimming resource (ISR) technique of swimming and self rescue.

He adds: "At no point do we force our child to do anything she is unwilling to try.

"We are able to recognise infant/toddler fatigue in the swimming pool.

"Elizabeth is a very determined little girl and sometimes she wants to roll over and breath as she was taught and sometimes she wants to hold her breath the whole way.

"I was 100 per cent prepared to jump in at first sign of distress. Please watch some of the other videos I've posted of her swimming and spread the word."

Adam recommended that all parents should teach their children to swim 'because it only takes a moment for them to slip under and drown'.

"Sometimes the difference between life and death can be six inches of water and their ability to flip over on their back and take a breath," he warned.

The incredible footage shows the toddler swimming unaided and looking completely comfortable in the water.

She swims face down, turning on her back to rest when she needs to breathe and even jumps in, without arm bands, and swims to the far side of the pool unaided, without even taking a breather.

Since posting the explanation, the parents have received a flurry of applauding comments, claiming the baby will be a swimming Olympic star, she's learned a lifelong skill and congratulating the parents on their teaching her.

And some more amazing water baby pictures...