Is this for a small or wide neck bottle

Hi Rachel, These are the slim teats for small bottles the first choice teats are for wide neck bottles, I hope this helps. I have added a link to them here: https://www.babyonthemove.co.nz/feeding/bottle-feeding/bottle-teats/NukFirstChoiceLatexTeatsSize1MediumHole2Pk
 if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have.