So my daughter is 3 month old in just over a week... we have recently bought the next tommee tippee teets up ( size 2) the medium flow ones which are suitable for 3+ but also says that that is just a guide. Since buying them a couple of days ago a couple of times she has thrown all of her milk up after sitting her up to wind. But she's also not really drank as much milk today as she normally would. We've changed the teets back to the slow feed ones but the reason we changed them in the first place is because a lot of the time during her feeds (even at the start of a feed ) she will cry and it's like an annoyed cry. It seems as though the milk isn't coming out enough for her. But I'm just not sure if the medium flow teets have made her throw up.