Baby bottle in Avent "ISIS" breast pump
Hi everyone, I've acquired this unfortunately named breast pump from Avent which comes with a bottle and nipple. I've practiced putting it together and taking it apart and I have all the parts. 
Two questions:
1) How do I know what age baby the nipple is for if it doesn't say anywhere? Aren't all nipples graded by age and having different sized holes depending on age of baby?
2) How do I know if the bottle is BPA free if it doesn't say anywhere?
Does anyone have this system? Maybe I should write to the manufacturer?

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