Good morning I am writing to you regarding the above product. I purchased these few weeks ago from tesco as I have other tommee tippee bottles and they are brilliant so couldn't resist these in the lovely colours. But nearly every time I use them, they leak half way through feeding, it's like the bottle top works his way loose and all of a sudden the milk is going everywhere. It makes for a very unhappy baby when I have to take the bottle away to clear her up from all the leaked milk. It's such a shame as they are lovely bottles. I'm not going to be able to use them anymore as I don't want to risk this happening so unfortunately has been a waste of money. I hope something can be done to rectify my dissatisfaction I look forward to hearing from you My email is; [protected]@hotmail.co.uk Thanks Kirsty rogers