I take this Mam bottles for 6 months now, as I unfortunately could satisfy only 4 weeks.
Before that I tried all sorts of bottles (Avent, Nuk, Baby Love, Baby Dream etc), but my daughter got after every meal abdominal pain and screamed like a stuck pig.
Lefax has brought nothing, other attachments for each bottle brought nothing and I do not mention how much money we have spent on testing well!
By chance I discovered the Internet, the Mam bottles, looked at the video and they unceremoniously ordered, since they're pretty cheap compared.
Meanwhile, I recommend to anyone who asks or feeding problems has only those bottles.
My daughter has two meals needed to get used to it and bang: from then on we had no more colic!
The spit has become much less (and my little one is drinking evenly without lifting once their bottle empty!
The cleaning works great. I wash the bottles thoroughly in the evening and every 2-3 days they come in the microwave to sterilize what I find totally practical, since we had not bought a sterilizer!
The only drawback is that you have to turn really fixed the digging, so they are really tight. It took me about a week and I had the hang of it. Before, it was annoying as you have it usually only noticed when feeding.
So Conclusion:
Clear purchase recommendation!
Best Regards
Cathrin