I am still using these with Hailey. The OT suggested for a few weeks. I noticed that she sucks on it so hard that she flattens the nipple. Makes me think she's ready for a regular nipple. I have a doc appt on Thursday, think I should wait and ask or give it a try? I am so afraid she is going to choke expecting the slow flow one but she can't stay on that one forever!! ugh. decisions decisions WWYD?