Dr Brown bottles

im experimenting with bottles-& so iPurchased some Dr Brown bottles the box it came in just says "3 pack 4oz 120 ml STANDARD". iGot home, did some research-&turns out Dr Brown like many other bottle brands, have different levels of nipples for different age groups. Im trying to figure out what level the ones iBought are. All they say is STANDARD. Anyone else use these?? What was your experience-& your opinion?

[maize87]

If they say standard they may not be the type that  adjust to the different sucking stages if that make sense. Some bottle manufacturers offer just a standard bottle

[expectingtwins2013]

I use Dr browns and the standard is a level one slow flow nipple, then they go up to level 2 & 3 and also have a y cut for when cereal is added.