Is Medium Flow a "Level 2"? I have the 5 oz bottles and the nipples they came with are "level 2" I need to know if I buy Medium if it is the same?

Medium flow is "level 3." "Level 2" is slow flow. I have no idea what level 1 is. Preemie, maybe?There should be an "S" on the nipples that came with the bottles. There's an "M" on the medium flow nipples.

Are there any glass bottles that these nipples will fit on? *UPDATE: I found that these fit on the Born Free glass bottles. The other customer was right in that they do NOT fit on the Avent glass bottles.

I found that they DO work with the AVENT natural glass bottles. Although it doesn't seem like they fit at first because the top of the ring doesn't line up like the AVENT nipples do, and the ring doesn't seem to screw down all the way, it DOES form a leak-proof seal.

ASIN	B006YPTWLS
Age Range Description	Infant
Best Sellers Rank	#869 in Baby Products ( See Top 100 in Baby Products ) #12 in Baby Bottle Nipples
Bottle Nipple Type	Fast Flow
Bottle nipple type	Fast Flow
Brand	Lansinoh
Customer Reviews	4.6 out of 5 stars 4,062 Reviews
Included Components	2 Lansinoh NaturalWave® in fast flow
Item Weight	1.5 Ounces
Liquid Flow Speed	Fast Flow, Slow Flow
Liquid flow speed description	Fast Flow, Slow Flow
Manufacturer	Lansinoh Laboratories
Material	Silicone
Material Type	Silicone
Material Type Free	BPA/BPS Free
Material type free	BPA/BPS Free
Size	2 Count (Pack of 1)
UPC	044677710251
Unit Count	2 Count

Lansinoh NaturalWave, Fast Flow (4L), 2 Count

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