Travel website Mini Travellers reviews our UV All-in-One and Happy Nappy Wetsuit highlights include

 “The UV suit is made of lightweight material which in temperatures close to 30 degrees meant Matilda stayed cool." 

And the Happy Nappy Wetsuit “ It is 2 in 1, the bottom half a standard Happy Nappy for peace of mind that there will be no leaks, with a 1mm neoprene long sleeve top attached to keep them warm."

https://minitravellers.co.uk/travel-tips-splash-about-swimwear-for-babies/