His mother used to say he never had a routine and did what he wanted and we both disagreed with this and knew the importance of structure for our daughter. Now he is living with her he is now of the same opinion
His mother may have chosen child-led parenting, but I assume that there was consistency and stability for the child because he was with her all of the time and didn't have to adjust or adapt to his df imposing a structured routine on those days when he was in his df's care.
Childen need consistency and stability and I believe that this is particularly important for pre and non-verbal children, and more especially for infants who can become unsettled when their usual routine, whether this is child-led or structured, is disturbed.
Your stbxh is behaving like a complete twat and showing very little consideration for the needs of your dc. He may have the right to parent as he wishes, but not at the expense of his child, nor should his parenting style cause her to be needlessly confused or upset which I'm sure she would be if she's deprived of her mid-day breast feed and nap.
I'm surprised at some of the responses you've been given and I refuse to believe that so many parents would be as cavalier about their children's welfare as they claim to be.
I suggest you report your thread and ask mumsnet to move it to the Relationships board where responders are more likely to put the welfare and well-being of your dd first and foremost.