The package didn't say so. But I think this is for newborn and up as the nipples are quite small.
Another reference is this link http://www.target.com/p/dr-brown-s-natural-flow-8oz-3pk-standard-polypropylene-baby-bottle/-/A-10930727. They are very similar if not exactly the same.
Best bottles ever just wanted to say that!! My son wouldn't take to so many diff kinds of bottles and these were a life savor :) hope u get lots of bids!!!!