Help Please - How to tell low flow and med flow nipples apart.

DiscusCoach

So DD still takes a bottle at night and at nap time and I have been feeding DS BM in bottles (no formula but the bottles seem to work for us right now). 

DD's nipples are med-flow Medela. DS's nipples are slow flow Medela. Is there some easy way to tell them apart because, for the life of me, I don't see a difference that is easily discernable. The low flow's hole may be smaller but it is SO hard to tell.

Long story short - I have a problem. If DS gets a med-flow he chokes and gets air and I have to get up and change nipples and hope for better luck.

Also, I agree it would have been smart to mark them and I tried. I marked the bottom rim of the low-flow nips with permanent marker. Just a dot. The sharpie washed off in the dishwasher.Right now I took one that I know if low flow and it is sitting with the bottom rim in food coloring. I am hoping this works. 

Any other ideas?  

hjweber

All of my bottle nipples say 'slow' 'medium' or 'fast' right on the nipple.  It's kind of hard to spot but it's there on the side by the rim of the nipple.  

suzyqjmu

hjweber:

All of my bottle nipples say 'slow' 'medium' or 'fast' right on the nipple.  It's kind of hard to spot but it's there on the side by the rim of the nipple.  

This

vnstacie

hjweber:

All of my bottle nipples say 'slow' 'medium' or 'fast' right on the nipple.  It's kind of hard to spot but it's there on the side by the rim of the nipple.  

This, or they have numbers on the bottom

Pockety

My Medela nipples say, on the rim, S Flow or M Flow.  S = slow, M = medium.