After having trouble breast feeding, I had to switch to bottle fed due to my sons tongue tie and refusal to feed. I started with tommee tippee as they had good reviews, but my son hated them. He had bad wind and kept being sick. Decided to try these bottles and was the best thing I ever did! You can sterilise one bottle at a time, or six! It’s anti colic and the tears don’t sink into the bottle like the tommee tippee! I’m now on the next stage up, which you do have to use a steriliser, but honestly the best bottles around. And the designs are so cute! Also on the water bottle from MAM now, amazing products!