My DS loves swimming and is good for age. Sometimes though, after a 30 min swim or hour swim, he comes out of the pool with blue lips and shivering and white with cold. Today he swam for just 30mins, worked exceptionally hard (lengths up and down pool for whole 30 mins), and when he came out he shivered uncontrollably, had blueish lips and looked extremely pale. His brother, who is younger and spent half the time sitting about not swimming, was fine.
Is there something medically wrong with DS? He is thin but I thought swimming pools only caused this reaction in the under 5s? And not if you are swimming intensively (and I assume therefore generating a lot of heat?)
Any advice please? I'm really worried but he loves swimming and hopes to join a club with hour long regular swims in a coldish pool soon, so I don't want to stop him swimming???