Bathtime getting scary!

[tears_of_joy]

DS is nearly 8 months and everynight for the last week or so has started standing in the bath.

Usually i lay him down on his back, wash him then he will roll himself over on to his tummy and i will wash his back etc then he sits up for a splash.

Now he trys to roll as soon as he is in there, and when he does its straight up onto his knee's and pulling himself up the side of the bath, and omg he is so quick! I have tried sitting him when i first put him in thinking that splashing may distract him while i get him washed but nope he still does it.

I have been saying no ethan, we sit down in the bath then sitting him down, but he gets up again no sooner than i have sat him back down.

Its getting rather frightening as i am terrified he will slip, i also use a little oils in his bath so it is pretty slippery. Does anyone have any tips on how i can keep him seated in the bath?