It's summer. Families across the world will be flocking to pools, making the most of the sunshine while it lasts. While for many it will be an event-free summer, full of excitement and the odd scraped knee, one mom has shared her cautionary tale. Maribeth Leeson almost lost her 5-year-old son, Adam, when he drowned at a local pool. Leeson took to Facebook to explain the events in great detail, in the hope that other families could learn from her experience.

Leeson was at the pool with a friend and her other children, when Adam went out of view. "When I found him myself, 2 feet from adults who were in the pool, my first thought was that it wasn't him, that it was someone else's kid who was seeing how long they could hold their breath," writes the distraught mother. Adam's mom goes on to say that the incident was "100% preventable". As she was busy attending to her other kids, she let her son go into the shallow end of the pool for five minutes, with the intention of going over when she was done. At that time, Adam wasn't wearing a float suit or armbands.

"I thought it was fine for 5 minutes, as he could touch just fine in the shallow end, he wasn't alone because there were multiple adults in the pool, and I'd be right next to the pool getting (my daughter's) suit on. Wrong. I have never ever been so wrong," laments Leeson. Thankfully, family friend Kristin Moon came to the rescue and performed CPR on the child, who regained consciousness after a few minutes. When Maribeth asked her son what happened in the pool, he remembered everything.

According to the youngster, he slipped off the edge that separates the shallow end from the deep end. Although he tried to keep his head above water, he couldn't. Leeson is keen for others to recognize what she didn't. As there were other adults in the pool, she assumed that if her son encountered any difficulty, they would be able to assist. "But those adults didn't know his swimming ability so they didn't question when he was underwater," she writes. She also wants parents to recognize the signs of a struggle; namely, that there aren't always signs. In Adam's case, he wasn't thrashing or screaming. "He was simply underwater and couldn't get his head above water."

Lastly, Leeson encourages all parents to learn CPR. Although she knows it herself, she was in such a state of shock that her friend stepped in to save Adam's life. However, had she been alone, Leeson would've been forced to do it herself. Knowing CPR can be the difference between a life saved and a life lost. Remarkably, Adam has made a full recovery, although Leeson admits that he seems anxious at being left alone.

Related: A Drowning Investigator's Plea To Parents About Water Safety Goes Viral