Pooing in the bath

Okay, not sure if this is a problem or not, but weird. Jake has, for the last three baths, pooed in the bath. He's never done this before since he was little. Now, because i figured he's not toilet trained I've not made a big deal about. I say "honey, try and tell mummy if you need to go, you can get out if you like". Anyway, today he did it and I saw him and said really calmly, "Jake do you need to get out", and he got a firght. he jumped and looked at the poo, and cried, like he knew he'd done something wrong. I got him out and had a little cuddle before he went out to get dressed, but it was just weird. he's not the sort of kid to act like that. Any ideas?

Apparently because water is really relaxing it can relax all bits and make it a lot easier to poo in the bath. I'd follow Nikki's great advice - sheck out the poo patterns and see if you can 'catch' him before he plants a floater.
Good luck