These bottles are SO frustrating.
I bought them for my second baby (currently 6 weeks old). I used Dr Brown's with my first born but the MAM bottles looked simpler to use with the added bonus of self sterilisation.
Most of the feeds that I make up using the MAM bottles leak from the bottom; even when assembled very carefully. This is stressful when you have a crying, hungry baby and you just want to get him fed.
My husband keeps telling me to throw them away! When I eventually get round to buying new ones, I will. Having a new born can be stressful enough without having to deal with these bottles.