What is the flow of these bottles comparable to? Level 3?

It's pretty open. They flow like a sippy cup

Some reviews say these work with the traditional bottles and some say only with the new "options" bottles. Can someone clarify?

If you are using the old bottles with the blue vents and the old lids, you will need to use the vent because it’ll leak, but it you are using the options bottles (with the smooth lids) you don’t need to use a vent. The older bottles are designed to be used with vents regardless of what nipple you use. Some pictures that I’ve seen to why it “doesn’t work” seems to be the case.

Do these fit other standard bottles?

It fits Pigeon's. Since Pigeon and Medela standard bottles are interchangeable, I'd assume it fits Medela's too.

Are these nipples being used when baby is still drinking breast milk/formula?

Thank you for your inquiry. The Dr. Brown's Standard Neck Transition Sippy Spouts are used to help baby transition from a bottle to a sippy cup. The sippy spouts can be used with breast milk/formula.

Product Dimensions	2.1 x 2.1 x 3.5 inches
Item model number	SR210-P4
Target gender	Unisex
Material Type	Silicone
Material Composition	100% Silicone
Material free	BPA Free
Care instructions	Machine Wash
Additional product features	dishwasher safe, freezer_safe
Number Of Items	1
Style	Sippy Spouts
Batteries required	No
Dishwasher safe	Yes
Bottle nipple type	Vented
Bottle type	Vented Bottle
Item Weight	0.634 ounces

Dr. Brown’s Milestones Options+ Sippy Spouts, 2-Pack Narrow, Soft 100% Silicone Baby Bottle Sippy Spout, 6m+

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