We use the Dr brown straw bottles and she can tilt n still get milk out!
My son wasn’t holding his either, we use Philips Avent natural response glass, so I bought these silicone sleeves on Amazon and they have handles and now he can hold it by himself and I don’t have to worry about it breaking if he drops it
Following because same. I wanted mine to have a bottle of milk and she just won’t hold it. She loves her straw trainer by nuk. If your open that works great for her