Both my sister and my friend use the avent bottles as they are advertised as the best for your baby especially with colic. But they are absolutely the most annoying thing I have ever used. Nearly every time you shake the bottle or tip it up to feed the baby it leaks everywhere. Does'nt matter what you do and I can't figure out why they do this. It is really frustrating not only at 1.00am in the morning when this happens but also the fact that they cost a lot of money. I know that it is not just me and something needs to be done about this by the company. It has drenched my baby, the pram, car seat, lounge, bedding all sorts and surely can be fixed. I would like the company to acknowledge this as I, like many mums have spent over hundreds of dollars on the bottles, teats and extras.