@klorene, I've used avent and she didn't like them. I've used breast flow and she kinda likes those. I've tried other kinds but she really likes the Dr Brown's. @rebalouise I have no idea I didn't even look. every time I use them I make sure the middle piece is on but a couple times it was sideways.

Also if you wash them in the dish washer it may have gotten to hot & melted the pieces a little bit, that happened to me as well & I had to replace all the bottles

Are the nipples wore out on them? You may need new ones. And I know this sounds dumb, but I've done it 1000x times 😂😂 are you putting the middle piece in? I know I've forgot so many times & if all the pieces aren't in there it'll leak

I had that same problem! No matter what I did I could not get them to not leak.. The top always looked crooked no matter how many times I re did it... Occasionally I got lucky and they wouldnt leak... Although I am sorry you are struggling with the issue, I am also glad I wasnt an idiot... I also used avent and playtex and had no issues with leaka from those, also the lids sit over the opening of the nipples so if they tip over in your bag they dont leak!

they sell the nipples for those bottles seperare. id try to replace the nipples