I came here to say the exact same thing. My little boy is also 2 and has drank from a normal cup probably since 1.5 years old, yes he has accidents but that normal, he also can use a straw or a sippy cup or a sports bottle type too, so not sure why her 3.5 year old can’t drink from a normal bottle! Pure lazinessI don’t get it. My little boy is 2 and will easily and happily drink his water out of a “normal bottle” intact if he sees us with a normal bottle, he insists on holding it and having some himself.