We had a very regimented routine with dd1. Although it was fantastic at the time, i can say with hindsight that it was the worse thing that i could have done! My dd1 copes soooooo badly with change of any sort, she has to know exactly what is coming next in her day (and the following day usually) and has only recently (she is now 8) allowed herself to 'go with the flow' but she is still unhappy with it.
Now, of course it could be her personality type that dictates this, but i'm more inclined to believe that it was because there were no deviations to her 'schedule' when she was little ...
With dd2 there were no routines imposed whatsoever. She did fall into her own routines, for example, bedtime at the same time each night and obviously having to get big sister to playgroup etc. but other than that, she got fed when the rest of us ate, she napped when she was tired, she played when she was awake. She is a much much more carefree little girl, who adapts easily to change. She is a sensitive soul just like her sister, but somehow seems more able to cope. Again, this is possibly just her personality (guess we'll never know) but i do believe that she is more able to adapt because she hasn't lived by strict 'rules'.
Dd3 is 7 months old and again, we have imposed no routine. She has fell into her own nighttime routine and tends to go bed about an hour before her sisters but i don't look at the clock for her bedtime - i watch her!
She eats when we eat and naps when she's tired (which is not very often as it goes ...). As for how well she copes with change and such like, we'll just have to wait and see ...
What is certain is that lack of routine is much much easier for us