I have to agree with snog 
I think it's choice rather than necessity no matter how other posters dress it up saying their baby cries. All babies cry, it doesn't harm them for a short time it takes to go to the bathroom.
I understand posters who don't mind and don't moan but I was told 'you literally cannot do anything when you have a baby' I was quite anxious about this. I was delighted when I found that not to be the case.
I think good for you on the people who close to have their children in the toilet and also good for you on those who don't. It really is each to their own.
I think there are others on here besides snog as some posters are implying, who are trying to over justify their decision with tales of woe and hardship and 'ill do what's right for my baby'.
Snog wasn't saying not to do what's right for your baby she was merely pointing out a true fact that it's not impossible to go alone so why do people moan? (Besides the people moaning in jest!)
Some people seriously believe they physically cannot go alone and their poor dc will spontaneously combust if they are away going to the toilet for even one minute. This is definitely choice and either way as long as you and your children are happy who cares!
Just don't moan when you can change it if you don't like it!