I thought I had found THE bottle for my baby 1 ½ months to wean ... Big disappointment! Teat speed 1 to speed too fast, failed in my baby choke 2 times ... The Tommee Tippee mam and teats are more suitable! Systeme innovative supposedly closing ... Who are we kidding do we? The clip is very hard to close, it seems to twist every time. Also very hard to unclip and it shows signs of fatigue from the first 2 use. Range to flee for the safety of baby and mum comfort ...