I love bibs nipples so much. I have used both silicone and rubber nipples by bibs and they are really good quality nipples that work very well at managing gas. I use slow flow for my 3 month old, and I think they are on the faster end of slow compared to most other brands. I think the rubber is good for breastfed babies, it’s definitely got a skin like feel to it. Prior to using bibs, I used the avent anti colic bottles with the extra parts and these work just as good at managing all the bubbles!