A surfer that changes colour when it gets wet.

Marius the Rhino rides a board printed with heat-reactive ink. Put it in warm water and the design transforms while your child watches; take it out and it returns to how it started. Children test it over and over, which is precisely the point.

Marius is the rocker of the group, all attitude and a very tender heart.

It floats, so it can be pushed and raced along the surface rather than sitting on the bottom. There are no squirt holes, which means no water trapped inside and no hidden mould, the failure mode of almost every other bath toy.

Rinse in clean water and dry thoroughly after each use.

Lilliputiens is a Belgian brand, founded in 1995 and designed by a team largely made up of parents working alongside early-childhood specialists.

THE COLOURS CHANGE IN THE WATER - Dip the surfer in warm water and the design shifts in front of your child. Lift it out and it changes back. It is a small piece of magic that never quite stops being interesting.

MARIUS THE RHINO ON A SURFBOARD - Marius is the rocker of the group, all attitude and a very tender heart.

FLOATS AND RIDES - Designed to sit on the surface so it can be pushed across the water, raced along the edge of the tub and wiped out spectacularly. Bath toys that move get played with.

EASY TO KEEP CLEAN - No holes to squirt water through means no water trapped inside and no mould building up where you cannot see it. Rinse and dry after use.

FOR THE OLDER BATH RESISTER - Aimed at two years and up, the age where the novelty of the bath has worn off and something genuinely surprising is needed to get them in.

2 years and above

Neoprene and plastic with heat-reactive printing

MARIUS MAGIC BATH SURFERS