I am a mom of 4 wonderful children and I have used these bottles for ever one of them. I have a 5 month old that has to have cereal mixed with her fomula, and thses are great for that. My 20 month old is finally on sippy cups and he used theses until recently. I put the liner in and fill with water and I can go anywhere and not have to worry about anything. I used the 6 and 4 oz bottles. Really, these save my life. I am so busy with all my children and being a single mom. So I love these… read full review »