With DD1 it wasn't til I got a hand pump at about 3 weeks & got 2 bottles with it that I used them, but I had probs feeding & only got to 6 weeks.

With DD2 I had the bottles & formula jic. I didn't want to get caught out & stressed about my baby starving again.

With DS I had a heap of stuff given to me, including 8 Avent bottles & a steriliser. I've used them on occasion. They are handy to have.