One nervous-looking infant dons a red sun hat with a matching romper suit as they paddle through the water.

Another can’t seem to work out what is happening, as he looks up at the world on the surface as he paddles.

Babies can start swimming straight away after birth, though most baby swim classes will start at six weeks. Pictured: A baby girl in a two piece swimsuit and pretty headband looks like a pro as she swims around underwater

Babies can start swimming straight away after birth, though most baby swim classes will start at six weeks. Pictured: A baby girl in a two piece swimsuit and pretty headband looks like a pro as she swims around underwater

Nekrasov is a professional diver that has been working in underwater photography since 1984. Pictured: A confused baby boy keeps his eye on the world at the surface as he dives underwater

Nekrasov is a professional diver that has been working in underwater photography since 1984. Pictured: A confused baby boy keeps his eye on the world at the surface as he dives underwater

According to Baby Centre, babies can start swimming straight away after birth, though most baby swim classes will start at six weeks so their mothers can take them as new mums are advised to wait until they are six weeks postpartum to start swimming.

Babies should only swim in pools that are at least 32 degrees celsius to avoid them being getting too cold, but many public pools will be below this temperature.

The photographer Nekrasov is a professional diver that has been working in underwater photography since 1984, according to his website.

His other subjects have included pregnant women underwater, animal photographer and pictures of shipwrecks.

Nekrasov's other subjects have included pregnant women underwater, animal photographer and pictures of shipwrecks. Pictured: A baby in an adorable sunhat and matching romper suit looks unsure about learning this new skill 

Nekrasov’s other subjects have included pregnant women underwater, animal photographer and pictures of shipwrecks. Pictured: A baby in an adorable sunhat and matching romper suit looks unsure about learning this new skill

New mums are advised to wait until they are six weeks postpartum to start swimming with their babies. Pictured: A little boy in a white outfit looks a little fearful as he explores his new underwater world

New mums are advised to wait until they are six weeks postpartum to start swimming with their babies. Pictured: A little boy in a white outfit looks a little fearful as he explores his new underwater world