How much milk should I let my DD (6 years old) drink? She's tall and maybe a bit "robust" - so I'm a bit concerned about letting her have too much (wrt robustnes... I've got no problem with her being tall!) - the problem is she'd have loads and loads if I let her and she doesn't like drinking anything else either. She's just asked me for another big glass full and I feel a bit mean saying no. Gah.